Which type of fossil can help us understand an organism’s activity during its lifetime? A.

B.

C.

D.

Ineed to know why d is the correct answer asap

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna