scientist have inferred that there have been at least five mass extensions in earth history how would fossil evidence support this inference

Drag each tile to the correct box. arrange the layers and faults from oldest to youngest.

Besides regulating what enters and leaves the cell, what is another function of your choice from question #1?

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?