what is the best explanation of how scientists know cyanobacteria existed 3.5 billion years ago

A; They were found in fossils that scientists were able to date

B; They have learned alot

C; None Of These

D; They saw it growing today and were able to date it back

If the frequency of the p allele is .63 in the population then what is the frequency of the q allele?

Step 1 review the imaginary strand of dna below. note the complementary base pairs. a g c a a t c c g t c t t g g t c g t t a g g c a g a a c c step 2 to begin replicating this strand of dna, draw the two sides of the strand separating. step 3 now, draw the free-floating bases linking up with the separate sides. remember to follow the rules of complementary base pairing. step 4 draw the two resulting dna strands.

In what cells is the human genome located?