I think that it's Photosynthesis?
Quick Answer. Collagen is the protein that all animals have in common, even single-celled animals and creatures such as sponges that lack differentiated bodies. Collagen is a cable-like protein that can calcify into bone, shell or other hard structures.
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Answer:
A Y-chromosome
Explanation:
Males have one X and one Y chromosome
Answer:
What do you want me to label?
Explanation: