Answer:
An index fossil is a fossil used to determine the age of the sediments in which it is found. When quickly approximating the age of new finds, an archaeologist looks at the rocks in which it is buried, as those sediments would have been on the surface at the time of the death of the pre-historic creature.
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Answer:
Mass
Explanation:
The larger a star's mass, the shorter it's lifespan.
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A cell with a nucleus. The opposite is a prokaryote; a cell without a nucleus.
Answer:
sharks are not cold blood killers because they don't kill for fun they kill because they are confused because when they see a human in the water swimming or splashing so they might try to investigate but sharks have more to fear to us than we do to them
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A
addition mutationadeition mutation
so its A
