Answer:
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The answer is b)
The niche is the job the animal does in it's habitat to contribute to the habitat.
Answer and Explanation:
The transport and digestion of proteins is done by other proteins called enzymes. An example of this occurs in the biochemical digestion of proteins, where the enzyme pepsin promotes digestion, the breakdown of proteins into smaller pieces, through hydrolysis which is the breakdown of molecules with the use of water. These pieces of the protein are transported to the duodenum where they are digested again by the enzyme enterokinase.
The sender is.....Nucleotides. DNA is made of chemical building blocks called nucleotides.