Which of these must exist for natural selection to cause change ?

Answers

Answer 1

Answer:

The answer is A.

Explanation:

Related Questions

The last few miles of the marathon are the most difficult for Heather. Her hair is plastered to her head, sweat clings to her arms, and her legs feel as if they had nothing left. Heather grabs a cup of ice water. The ice cubes smash against her nose as she gulps some cool refreshment and keeps on running. Then a breeze kicks up and she finally feels some coolness against her skin. Drops of sweat, once clinging to her forehead, now spill down, and Heather feels a stinging as the sweat flows into her eyes.Sweat on Heather’s forehead and arms formed drops because of the ______.

Answers

Answer:

heat.

Explanation:

Answer:

Hello! I am sorry I am late.

The answer is heat.

Explanation:

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What are digestive enzymes? Give three examples of digestive enzymes and briefly describe their specific functions.

Answers

Answer:

Digestive enzymes are the natural substances our body needs to help break down and digest food

We have three main digestive enzymes :

Proteases: These enzymes break down protein into small peptides and amino acids.

Lipases: break down fat into three fatty acids plus a glycerol molecule.

Amylases: Are responsible for breaking down carbs like starch into simple sugars.

Explanation:

Digestive enzymes are proteins that catalyze mainly hydrolysis reactions that make nutrients absorbable in the digestive tract. Pepsin is a gastric enzyme that turns proteins into albumoses and peptones which are shorter peptide chains that are then hydrolyzed to even shorter chains until amino acids by intestinal enzymes. Pancreatic amylase is an enzyme that turns starch(a polysaccharide) into maltose(a disaccharide). Lipase is present in the gastric juice, the pancreatic juice, and the intestinal juice. This enzyme catalyzes the hydrolysis of lipids(mainly triglycerides) into fatty acids and glycerol. When incomplete hydrolysis occurs triglycerides can become monoglycerides.

what are chloroplasts? why are they green? how is the green colour plant of a great importance to the whole living world? explain?

Answers

Answer:

Chloroplasts are structures found in the cytoplasm of plant cells that are the site for photosynthesis. They are green because they contain a pigment called chlorophyll. Chlorophyll absorbs light to bring about the photosynthesis reaction. Light energy is crucial to initiate photosynthesis.

Photosynthesis allows the plant to convert carbon dioxide from air and water absorbed from the roots into oxygen and glucose, which are foods for plants. By releasing oxygen to air through photosynthesis, other living things can breathe in oxygen so that energy can be generated through another process, called respiration. Respiration is like the reverse reaction of photosynthesis, but it turns glucose to energy that supports living things.

Because plants also respire to generate energy, by using the glucose produced from photosynthesis, it also supports the food chain in the living world. Other organisms can consume plants for their energy.

In the end, chloroplasts and the chlorophyll inside are very important to the living world.

Other Questions

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