The branch of biology dealing with interactions along organisms and between organisms and their environment is called Ecology, I believe.
Answer: Collagen is the most abundant protein in the body. Its fiber-like structure is used to make connective tissue. Like the name implies, this type of tissue connects other tissues and is a major component of bone, skin, muscles, tendons, and cartilage
Explanation:
D. ecosystem to biome
biome would be like a whole desert but an ecosystem would be a small part of that
B:Heterotrophs hope this helps :)
