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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A good reason for why tobacco smoke is considered a carcinogen is because it causes mutations leading to cancer.
Some risks associated with using GMOs are that they can grow resistant to the antibodies, have decreased nutrition in some cases, and there are some health effects as a result of them.