It is best to say that the protection to properties offered by sea walls along coasts
a. decreases the present and future risk to human properties
b. increases both the present and future risk to human properties
c. decreases the present but increases the future risk
d. increases the present but decreases the future risk

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?