List 2 pros and 2 cons each of a high population density.

Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating

Which fossil organism in whale evolution do you think was the first to live mostly in water? explain your claim with evidence and reasoning?

Ascientist is examining the role of an element found in facts and carbohydrates of living things. this element makes up 65% of human body mass. which statement describes he is studying