A metallurgical microscope
Keratin
Protecting the skin is one of its main responsibilities as a protein in epidermis.
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An invertebrate, because an animal with a vertebrate is an animal with a backbone.
Answer: If you crossed the parents of GG and gg all plants would be green because if the parent with two dominate genes could only give a dominant G to each child all children would have a dominate G gene therefore all children on this cross would be dark green.
