Body fossils include bones, teeth, claws and skin. Therefore the answer would be A, imprints.
Biosphere is one of the four sub systems of earth. It contains all the living things in the planet. So, plants and animals, as well as microorganisms are part of the biosphere. Humans can also be part of the biosphere according to some scientist, but others put them in another sphere - anthrosphere.
Answer:
This type of key is called a "dichotomous" key because the meaning of the word is "two branching". The structure of the key is such that each question is actually like a tree branch that has two smaller branches proceeding from it.
