The answer to 3 is B. Moon
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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The outermost layer of the Earth is called the crust.
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1. a. Toxicodendron
2. c. Eukaryotes
3. a. Felis domesticus
4. b. Plantae
5. a. Protist
6. While protists are unicellular eukaryotes can be both single or multicelled. Most protists have special organelles and a nuclear membrane which differs from bacteria.
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