Just a guess, does it have something to do with appearance, aren't they all colorless, or have the cloudy opaque sheen?
The answer is convergent.
Answer:
A cocoon is a protective casing that protects and shelters the silkworm while its transitioning from predators and other threats. Within the cocoon the silkworm transitions into a pupa, the pups is the stage between the larvae and adult moth. After two weeks the pupa finishes it's transition into a moth.
protein is a macromolecule and protein is made up of amino acids.
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