Select all that apply. choose the statement(s) that best describe earth's hydrologic, rock, and tectonic cycles. they continuously recycle earth's materials. they contribute to a balance or equilibrium of earth's materials. old material is disposed of, never to be used again, and new material is created. the cycles are powered by the earth's rotation and orbit.

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?