what happens in a fertilisation of a plant​

Vertebrates have Closed circulatory systems in which blood remains within vessels that exchange materials with the interstitial fluid.

Closed circulatory systems are found in many invertebrates, including worms, mollusks, and arthropods. In this type of system, blood remains within vessels that exchange materials with the interstitial fluid, the fluid that bathes the cells of an organism. The vessels include arteries and veins, as well as specialized organs, such as the heart and a blood-filtering organ.

The vessels are typically lined with a thin layer of endothelium and small amounts of elastic connective tissue. The heart functions to pump the blood around the body and help maintain pressure, while the blood-filtering organ helps remove waste products from the blood and keep it clean. The arteries and veins work together to carry the blood around the body, exchanging materials with the interstitial fluid and delivering oxygen and nutrients to the cells.

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Answer: B. Neuritic zone

Drosophila exhibits an XY sex-determination system, where males have one X chromosome and one Y chromosome (XY), while females have two X chromosomes (XX). The key gene involved in sex determination in Drosophila is called the Sex-lethal (Sxl) gene.

The Sxl gene is located on the X chromosome and is responsible for controlling the sexual development of the fly. The mutation in the Drosophila gene sex lethal, where the third exon was never spliced out, will most likely result in an all-female sex determination. This is because the sex-lethal gene plays a critical role in regulating sex determination in Drosophila, and the mutation is likely to disrupt this process. Without proper splicing of the third exon, the sex-lethal protein may not function correctly, leading to a female-specific developmental pathway. Therefore, the most likely effect of this mutation is an all-female sex determination.

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The test tube contains amylase, starch, and a buffer that will set the different pH of the solution.

One of the most common enzymes utilized in industry is amylase. These enzymes hydrolyze the molecules of starch to create polymers made of glucose units. Amylases may be used in a variety of industrial activities, including those in the food, fermentation, and pharmaceutical sectors. Salivary alpha-amylase production is increased by psychological and social stress.

Ptyalin, an alpha-amylase produced by salivary glands in the digestive tracts of humans and many other mammals, is secreted into the small intestine by pancreatic amylase.

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Deep knee pit pain may be a symptom of a few different conditions, such as a Baker's cyst, popliteus tendinitis, or a meniscus tear. A Baker's cyst is a swelling caused by a buildup of fluid at the back of the knee. This swelling can cause pain, especially when the knee is bent or straightened. Popliteus tendinitis is a condition where the popliteus tendon, which runs along the back of the knee, becomes inflamed or strained. This can cause pain in the back of the knee, especially when bending or turning the leg. A meniscus tear is a tear in one of the two pieces of cartilage that act as cushions between the thigh bone and the shinbone in the knee joint. This can cause pain, especially with movement of the knee.

Answer: These impacts include compaction, loss of soil structure, nutrient degradation, and soil salinity. These are very real and at times severe issues. The effects of soil erosion go beyond the loss of fertile land.

Explanation:

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Amniocentesis is a prenatal diagnostic procedure carried out between 16 to 22 weeks of pregnancy. The body part for this procedure is the amniotic sac inside the uterus.

Amniocentesis is an important medical produce carried out during the beginning of the pregnancy. This test helps to detect any genetic or chromosomal abnormalities in the growing fetus. This condition is usually done between the 16 to 22 weeks of pregnancy.

In this procedure, the clear to yellowish fluid called amniotic fluid is taken from the amniotic sac that is surrounding the fetus in the uterus. Then, the DNA from the skin cells in that fluid is checked. This fluid also contains other waste products of the fetus.

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(a)The growth of international accounting in recent years can be attributed to several factors; Globalization, Stakeholder Demands, Regulatory Pressure. (b) Here are some ways in which culture impacts accounting; Accounting Principles and Practices, Regulatory Environment, Ethical Considerations.

Globalization: With the increasing interconnectedness of economies and the expansion of multinational companies, there is a growing need for a standardized accounting framework that can facilitate cross-border transactions and ensure consistency in financial reporting.

Investor and Stakeholder Demands: Investors and stakeholders have become more globally focused, seeking investment opportunities and partnerships in foreign markets. These stakeholders require reliable and transparent financial information to make informed decisions, leading to the need for international accounting standards.

Regulatory Pressure: Governments and regulatory bodies worldwide are recognizing the importance of harmonized accounting standards to promote transparency, accountability, and comparability.

The culture of a nation significantly influences both domestic and international accounting practices.  Here are some ways;

Accounting Principles and Practices: Culture shapes the underlying values, beliefs, and norms of a society, which in turn influence the development and application of accounting principles and practices. For example, cultures that prioritize individualism may have accounting systems that focus on individual financial performance, while collectivist cultures may emphasize the community or group's financial well-being.

Legal and Regulatory Environment: Culture influences the legal and regulatory framework within which accounting operates. Different cultures may have varying levels of acceptance for transparency, disclosure, and enforcement of accounting standards.

Ethical Considerations: Culture shapes ethical norms and values, which influence accounting decisions and practices. What may be considered acceptable ethical behavior in one culture may be viewed differently in another culture.

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The main cause of pollution in many nations is agriculture. Pesticides, fertilizers, and other hazardous agriculture chemicals can contaminate fresh water, marine habitats, the air, and the soil. They may also persist for many generations in the environment.

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the germinal stage of development begins at conception and lasts for two weeks. During this stage, the fertilized egg, also known as the zygote, undergoes rapid cell division and moves down the fallopian tube towards the uterus. Within the first week, the zygote implants itself into the lining of the uterus.

During the germinal stage, the zygote is dividing into more and more cells, eventually forming a ball of cells called a blastocyst. The blastocyst has an inner cell mass, which will develop into the embryo, and an outer layer of cells that will form the placenta and other supporting structures. The germinal stage is a crucial time for the developing embryo, as any problems or abnormalities that occur during this time can have significant impacts on later development. For example, genetic mutations or chromosomal abnormalities can result in miscarriage or birth defects.

Overall, the germinal stage is a critical period of development that sets the foundation for the rest of the prenatal period and ultimately, the child's life.

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Answer: peptide bond

Explanation: ^

The M phase of the cell cycle is referred to as the shortest phase. The stages of a cell's life that make up the cell cycle.

The cell cycle consists of four major stages: gap 1 (G1), synthesis (S), gap 2 (G2), and mitosis (M). Occasionally, cells will also enter a stationary phase known as G0 after exiting the cell division cycle.

Mitosis is the cell cycle's shortest stage. Cells grow and perform their functions within the body for the majority of their lives during the G1 phase. The process of cell division known as mitosis takes the shortest amount of time for cells to go through. In multicellular organisms, mitosis is required for growth and repair, and in unicellular organisms, it is required for asexual reproduction.

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In this case, a cross-sectional study design was employed to evaluate the association between vitamin and mineral deficiencies and headaches. This study design is commonly utilized to investigate the distribution and possible risk factors for a condition at a particular moment in time in a defined population.

Cross-sectional studies provide data on the frequency and distribution of risk factors, conditions, and diseases in a population, which is useful for identifying public health problems. Data were collected using a standardized questionnaire that inquired about patients' demographics, stress levels, and headache symptoms. Blood samples were collected and examined for vitamin and mineral concentrations in a laboratory. The mean age of the patients was 38 years, and 75 percent of them were female. More than 50% of the participants had mild to moderate stress levels, whereas 15% had severe stress levels. Approximately 40% of the participants had insufficient vitamin D levels, 30% had low iron levels, and 25% had low magnesium levels.

Deficiencies in magnesium and iron were found to be associated with headaches, whereas deficiencies in vitamin D were not found to be statistically significant. Stress was also found to be linked to headaches in this study. In conclusion, this cross-sectional study discovered that deficiencies in magnesium and iron and high levels of stress are linked to headaches.

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The pictures are shown for pathogens which are harmful to human body and 1st is virus 2nd is fungus 3rd is protozoa and 4th is bacteria.

Explanation: There are many pathogens that are harmful to people and they are harmful because they use the host machinery to replicate themselves and grow and also damages the host machinery and lyse the cell which in turn reduces the immunity of the host body and also make the host body prone to diseases leading to the early death of host or miserable life.

These pathogens are bacteria, protozoa, fungi, and viruses.

Virus - The viruses are considered as non-living or living depending upon whether they are outside the host cell or inside it as it they are outside they are nonliving and if inside they are living and have genetic material RNA or DNA and a protein coat called capsid.

Bacteria - The bacteria are also unicellular organisms which are prokaryotes and have a cell wall made up of peptidoglycan and can be divided in gram negative and gram-positive bacteria for example Xanthomonas.

Fungi - The fungi are multicellular organisms and have mycelia which is a thread-like structure in the form of a network called hyphae and they produce a different types of spores for their development.

Protozoa - They are microscopic and unicellular organisms and are eukaryotic in nature having complex structure and have complex metabolism and also have cilia for their movements.

So according to this 1st is virus 2nd is fungus 3rd is protozoa and 4th is bacteria.

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Answer:

get wheat that has the desired content (in this case high fiber content)

breed them

amongst the offsprings/ wheat produced, select the ones with highest fiber content

breed them

repeat this process for many generations

Explanation:

Artificial selection is a process of selective breeding where humans choose certain traits to breed for in plants or animals.

In the case of wheat, we could use artificial selection to develop a new breed of wheat with higher fiber content by selecting individual plants with the desired traits and breeding them together over several generations.

Below are the steps:

Identify wheat plants with higher fiber content: The first step would be to identify individual wheat plants that have naturally higher fiber content. This could be done by analyzing the fiber content of different varieties of wheat and selecting those with the highest fiber content.

Crossbreed the selected plants: Once we have identified wheat plants with high fiber content, we can crossbreed them to create a new hybrid variety. This involves taking the pollen from one plant and fertilizing the flowers of another plant with it. The resulting seeds will have a mix of genetic traits from both parent plants.

Select the desired traits in the hybrid plants: After the hybrid plants have grown, we would need to evaluate them for their fiber content. We would select the plants with the highest fiber content and use them as parents for the next generation of plants.

Repeat this process for several generations: The process of selective breeding would be repeated over several generations, with each generation being evaluated for fiber content and only the plants with the highest fiber content being used for breeding. This would increase the likelihood of producing a new wheat variety with consistently high fiber content.

Test and refine the new wheat variety: Once a new wheat variety with higher fiber content has been produced, it would need to be tested for its nutritional value, taste, and other characteristics. If the new variety meets the desired criteria, it could be released for commercial production.

In summary, artificial selection can be used to develop a new breed of wheat with higher fiber content by selectively breeding individual plants with high fiber content and repeating the process over several generations until a new variety with consistently high fiber content is produced.

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The following disasters which can affect an agent’s biosecurity at a given organization is referred to as tornado and is denoted as option B.

This is referred to as a violently rotating column of air touching the ground, usually attached to the base of a thunderstorm. It occurs within a convective cloud which is in contact with the ground.

Biosecurity on the other hand is defined as the measures which are carried out in other to prevent the introduction and/or spread of harmful organisms to animals and plants.

Tornado can affect an agent’s biosecurity at a given organization because it deals with air moving things from one place to another in a violent manner which could result in different forms of contamination which is therefore the reason why it was chosen as the correct choice.

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The options are:

Answer:

419.2 (+/- 3.2) million years ago

Explanation:

419.2 (+/- 3.2) million years ago

A. By breaking and reforming chemical bonds in the molecules

Answer:

silent

Explanation:

jus took the test

Silent mutation is a point mutation and not a frame-shift mutation.

MUTATION:

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Answer:

what is there to pick from?

Explanation:

The option that does not provide evidence that living things have been evolving for millions of years is intelligence. The correct option is C.

In science, evidence refers to any observations, measurements, or facts that support or refute a hypothesis or theory.

Intelligence is not a factor that provides evidence for evolution. The process of evolution is driven by natural selection, genetic mutations, and other biological factors, not intelligence.

On the other hand, the other answer choices are all factors that provide evidence for evolution:

(A) Fossil record: provides evidence of changes in species over time.

(B) Natural variation within a species: provides the raw material for evolution to act upon.

(D) Homologous structures of living organisms: provide evidence of common ancestry and evolution over time.

(E) Similarities in embryological development: provide evidence of shared evolutionary history and common ancestry.

Thus, the correct option is C.

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Your question seems incomplete, the probable complete question is:

Which would NOT likely be used as evidence of evolution?

(A) fossil record (B) natural variation within a species (C) intelligence (D) homologous structures of living organisms (E) similarities in embryological development

In the process of wound healing neutrophils plays a role in clearing wound for cellular debris.

Neutrophils are essential for the removal of cellular waste from wound sites during the healing process. White blood cells called neutrophils, which are a component of the immune system, are among the first to arrive at the site of infection or injury. They can feed on and eliminate germs, dead cells, and other material in the wound because of their great mobility. Phagocytosis, a process that helps clean and sterilize the wound, prepares it for further steps of healing.

Therefore, the correct option is B.

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Since the given organisms prepare their own food, hence none of the organisms mentioned are heterotrophs. Thus, the correct answer is Option D.

Heterotrophs are organisms that depend on other species (plants and animals) for food since they are unable to prepare it for themselves. They are dependent on these producers for food, either directly or indirectly.  

The rose and the pine tree, two of the choices given, are both autotrophs since plants can make their own food through photosynthesis. On the other hand, the deep-sea tubeworm is a chemoautotroph, meaning it gets its energy from inorganic substances in its surroundings.

Therefore, the correct answer is Option D.

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Answer:

Some of the organisms that can be found in pond water include:

Answer: Hydrogen

Explanation:

The answer is 50%, or B.

Answer:

Mesozoic Era

Explanation:

The "Mesozoic Era" is divided into three periods: Triassic, Jurassic and Cretaceous. During the last period (Cretaceous), which was considered the longest, the extinction of reptiles occurred and the new mammals appeared. This event was also known as the "Cretaceous-Paleogene Extinction Event." Around 3/4 of plants and animals died. Such event became significant boundary that laid between the Cenozoic Era and the Mesozoic Era. This made it significant in geologic history.