Use the text and the graph above to choose all of the correct answer concerning speed?

In some plants, pointed leaves (p) are dominant over rounded leaves (p). a plant with a genotype of pp

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

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?