Which of the following represents oxygen's potential path as it cycles? • A. Cat exhales. Oxygen molecules diffuse. - Plant takes in
oxygen for photosynthesis.
B. Squirrel exhales. - Oxygen falls as part of rain. - Oxygen is
taken in a through a plant's roots.
C. Plant releases oxygen. - Oxygen molecules diffuse. - Bear
inhales.
D. Oxygen percolates through
the soil. - Oxygen enters the ocean
and evaporates. - Dog inhales.

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?