I'm not sure how to classify this question so i'll just put it under biology why would a biologist be interested in sedimentary rocks?

How did the research presented in the article affect scientists' understanding of the evolution of eukaryotes

What was the land like over 500 million years ago? what was under the sea?

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.