Which of the following best supports the theory of continental drift? A
South America and Africa have completely different rock layers.

B
A hurricane hits the Gulf of Mexico at the beginning of June.

C
Similar fossils are found on the coasts of South America and Africa.

D
North America and South America are connected by land.

Assume that you are interested in separating short (200-400 bp) dna molecules from a pool of longer molecules in the 10,000-20,000 nucleotide range. you have two recipes for making your polyacrylamide gels: one recipe uses 1.5 percent agarose and would be considered a “hard gel,” while the other uses 0.5 percent agarose and would be considered a loose gel. which gel should you use to separate the short (200-400 bp) dna molecules from a pool of longer molecules in the 10,000-20,000 nucleotide range?