9.(02.03 MC) The coming together of two terrestrial plates can change ecosystems by (4 points)
decreasing the gene pool as different species of animals and plants to interbreed

introducing new species between previously-separated land masses, altering existing food chains

creating new habitats for land animals that fill niches at lower altitudes and warmer temperatures

increasing the area of the shoreline, providing more habitats for marine life that need greater sunlight

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?