A region experiences frequent landslides from heavy rains. How can the local residents lower the frequency of landslides in the region? Start contour plowing soil in valleys that are impacted by landslides.
Plant vegetation on the slopes that experience landsides.
Encourage deforestation in the regions that haven’t suffered landslides.
Divert water so it flows into the affected region.
Reduce the slopes where landslides occur.

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?