Walruses live in the Arctic and have a thick fat layer. The ancestors of the modern-day walruses might not have had such a thick layer. Over time, the walruses have probably changed. According to the theory of evolution by natural selection, what is the most likely reason that this change has probably occurred?

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.