Which scenario is an example of an organism displaying evolutionary adaptations that help it survive and reproduce? -A skunk gives birth in the fall as food becomes scarce.
-A mother sea turtle lays her eggs in the surf during low tide.
The female salamander lays several masses of 7 to 40 eggs about 6 inches below the water's surface.
-A female polar bear gives birth during the Arctic summer when the largest number of predators are active.

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?