Which two factors contributed to the extinction of many large mammals over the last several million years, including woolly mammoths, saber-toothed cats, and giant ground sloths?

A. loss of habitat and contact with humans
B. loss of habitat and low variation in population
C. low population size and a warming environment
D. a warming environment and contact with humans

Answer:

option A, because Lithium and Chlorine both have their valency 1.

hope that helps...

The chemical reactions are all around us the metabolism of food in our body and how we get light from sun are all chemical reactions. Here Mass was conserved in this chemical reaction because the same atoms are present in both the products and the reactants. The correct option is C.

A chemical reaction is defined as one in which the bonds are broken within the reactant molecules and results in the formation of new bonds within the product molecules in order to form a new substance.

The rate of a chemical reaction is affected by several factors like pressure, temperature and the concentration of the reactants. In a chemical reaction, a chemical change must occur.

The substances which appear on the left hand side of the chemical reaction are called reactants whereas the products appear on the right hand side. Here same atoms are present in both reactants and products.

Thus the correct option is C.

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Answer:

sanctuary is the answer may be I think

Answer:

Option B

Explanation:

This structure is a triglyceride having two unsaturated ( oleic acid , alpha-linolic acid) and one saturated fatty acid (palmitic acid). Remember, Triglyceride is a lipid.

A lipid with two unsaturated fatty acids and one saturated fatty acid.

Answer:

As altitude increases in Earth's atmosphere, both air pressure and the amount of oxygen decrease.

At sea level, the air pressure is about 1013.25 millibars (mb) and the concentration of oxygen is about 21%. As you go higher in the atmosphere, the air becomes thinner and less dense, so the air pressure decreases. At the same time, the concentration of oxygen also decreases because there is less air overall to contain oxygen molecules.

This is why it is harder to breathe at high altitudes, such as on a mountain. The air is less dense, so there are fewer oxygen molecules per breath and the body has to work harder to get enough oxygen.

Answer:4: Both Air and Oxygen decrease.

Explanation:This is in accordance with Henry's law. As pressure decreases solubility of gases decreases. Air pressure decreases as we altitude increases and the decrease in oxygen level is the consequence ,

Answer:

When hydrogen fuel burns, its atoms combine with oxygen atoms in the air, which creates a chemical reaction that releases energy in the form of heat and light. The hydrogen atoms lose their outermost electrons, becoming positively charged ions (protons). These ions combine with the oxygen atoms to form water molecules (H2O), which evaporate into the air as steam. Therefore, the atoms that make up hydrogen fuel ultimately become part of water molecules during the process of combustion.

Explanation:

c. The atom becomes positively charged

if the electrons are removed it means theres no longer a negative charge to balance the positive charge of the protons in the atom

The answer that best describes the continental shelf is thick deposits of sediments carried out from land. The correct option is b.

Geologists refer to the portion of the continental margin between the shoreline and the shelf break—or. In the absence of a discernible slope, between the shoreline and the point where the depth of the adjacent water is roughly between 100 and 200 meters—as the "continental shelf."

Where the continental shelf stops, the continental slope starts. It serves as a dividing line between the oceanic and continental crusts, much as its name suggests.

The continental slope separates the crusts of the continents and the oceans. Gravity's effect causes soil, boulders, and debris to eventually wash down the steep sides of a continental slope over time. At the bottom of the slope, they amass into a clump.

Therefore, the correct option is b, thick deposits of sediments carried out from land.

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Answer:

Based on the given instructions, you need to calculate the expected kinetic energy (KE) at each velocity using the formula KE = mv^2, where m is the mass and v is the speed. The mass is given as 0.250 kg.

Table B: Calculation of Kinetic Energy (KE)

Table B: Calculation of Kinetic Energy (KE)

Speed (m/s)Mass (kg)KE (kg m^2/s^2)20.2500.50030.2500.75040.2501.00050.2501.25060.2501.500

To calculate the kinetic energy at each velocity, multiply the mass (0.250 kg) by the square of the velocity.

For example, when the speed of the bottle is 2 m/s: KE = (0.250 kg) * (2 m/s)^2 = 0.250 kg * 4 m^2/s^2 = 1.000 kg m^2/s^2

Perform similar calculations for the other velocities and record the results in Table B.

Answer:

Explanation:mass of the bottle in each case is M = 0.250 kg

now as per given speeds we can use the formula of kinetic energy to find it

1) when speed is 2 m/s

kinetic energy is given as

2) when speed is 3 m/s

kinetic energy is given as

3) when speed is 4 m/s

kinetic energy is given as

4) when speed is 5 m/s

kinetic energy is given as

5) when speed is 6 m/s

kinetic energy is given as

Answer:

Oxygen is in group 16 in the periodic table.  All the elements in this group have in common the number of valence electrons in their outer shell (6 valence electrons).  The only reason I can see that they may be considered "mixed"  is because the group includes non metals and metalloids.

Explanation:

Answer: nucleus  

Explanation:

Answer:

It going to be confusing to see 10 skyscrapers that look the same and hard to go to the right one

Explanation:

Answer:

Most skyscrapers look some what alike because those are the building dimensions that need to be used in order to keep the building standing they cannot be built skinnier wider or taller or it could fall over or collapse injuring millions of people

Explanation:

Because it is easier for metals to shed their valence electrons and form cations for a stable configuration, they have comparatively few chances of acquiring electrons.

The metals usually complete their octet in each reaction. The outermost electron shell often contains more electrons in metals. Metal atoms lose electrons when they interact with other non-metals because the energy of an electron in its outermost shell is very weak.

Metals often have low ionization energy because their electrons are positive in nature. Metals lose their electrons and trade them with non-metals to achieve a stable configuration.

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Answer:

metals typically have relatively low ionization energies

Explanation:

Answer:

39

Explanation:

Relative mass does not need to be calculated as it is listed on the periodic table. Potassium's relative atomic mass is around 39.

Answer:

Enthalpy change = -98.6kJ

Explanation:

Based on the reaction:

2SO₂(g) + O₂(g) ⟶ 2SO₃(g), △H = -198 kJ

When 2 moles of SO₂ (Molar mass: 64.066g/mol) reacts with 1 mole of oxygen, enthalpy change is -198kJ

To know enthalpy change of 58.0g of SO₂ with excess oxygen we need to calculate moles of SO₂ thus:

58.0g SO₂ ₓ (1mol / 64.066g) = 0.905 moles SO₂

If 2 moles of SO₂ produce an enthalpy change of -198kJ, 0.905 moles SO₂ will produce:

0.905 moles SO₂ ₓ (-198kJ / 2 moles SO₂) =

Enthalpy change = -98.6kJ

Answer:

D. Rutherford

Explanation:

Answer: its 5ft tall and 12 inches

Explanation:

Answer: hydrogen-carbonate.

Explanation:Because when carbon dioxide is passed in excess it leads to a formation of hydrogen-carbonate.

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no:A

is a correct answer

Answer:

+6.

Explanation:

So, a chromium atom here has an oxidation number of +6.

Answer:

In the United States alone, the AKC's dog breed list currently includes 190 dog breeds. Worldwide, the FCI lists 360 officially recognized breeds.

Explanation:

Answer:

There could be several possible reasons for a small gap between rails on a railway track, such as:

1. Expansion joints: Railways are designed to allow the tracks to expand and contract with changes in temperature. To accommodate this expansion, small gaps are left between the rail ends and filled with expansion joints or plates.

2. Wear and tear: Over time, the rails may experience wear and tear due to heavy loads, weather conditions, and other factors. As a result, small gaps can appear between the rails.

3. Maintenance: During maintenance activities, rail tracks may be adjusted or replaced, which could lead to small gaps between the rails.

4. Environmental factors: Environmental factors such as soil shifts, earthquakes or other natural disasters can also affect the alignment of the rails, leading to small gaps.

These are some of the possible reasons for a small gap between the rails on a railway track.

Answer:

The small gap left between the rails in a railway track is intentional and serves a specific purpose. This gap is known as the rail joint, and it allows for the expansion and contraction of the rails due to changes in temperature. When the temperature changes, the metal rails will expand or contract, and if they were joined together tightly, they could buckle or become deformed, which could be dangerous for trains passing over them. The rail joint allows the rails to move slightly and prevent damage to the track.

Additionally, the rail joint also allows for maintenance and repairs of the track. If there were no gap between the rails, it would be challenging to replace a damaged rail or perform routine maintenance, such as tightening bolts or lubricating joints. With the rail joint, maintenance personnel can easily access and work on the track.

Overall, the small gap left between the rails in a railway track is intentional and serves a crucial function in ensuring the safety and reliability of the track.

Answer: the first paragraph is rain forest biome and the 2nd one is arctic tundra biome and finally the last paragraph is ocean or marine biome

Explanation:

rain forests have warm temperatures and include alot of animals and plants , artctic tundra biome includes cold temperatures ice stuff and all that and ocean or marine biome is pretty much just the ocean with seals , whales and marine life yk.

Answer:

energy is being used to make or break bonds between molecules

Explanation:

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