Three quarters of Earth’s surface is ocean. The aquatic communities found in the ocean are called marine ecosystems. Suppose the amount of sunlight in a marine ecosystem is drastically reduced. Identify two different effects this change in sunlight will have on the ecosystem and explain how each impacts the aquatic communities.

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?