I believe your answer would be:
A. Fossils.
Explanation:
Because they are the preserved remains or traces of animals, plants, and other organisms from the past. They're also important evidence for evolution because they show that life on earth was once different from life found on earth today.
Hope I helped, good luck! =)
Grams? Liters? Mililiters? And kilograms I think gallon cup pint ?
D. A protein catalyst in a living organism
The answer to this is the nucleus
