Give an example of an animal which uses mimicry and explain why it is helpful.

in it's broadest definition, mimicry can include non-living models. The specific terms masquerade and mimesis are sometimes used when the models are inanimate. For example, animals such as flower mantises, planthoppers, comma and geometer moth caterpillars resemble twigs, bark, leaves, bird droppings or flowers.

"do a testcross with a homozygous recessive plant."

the answer is c. it will give up it's valence electron to the other atom.