A scientist has divided a DNA molecule into several fragments. Next, the scientist would use gel electrophoresis to accomplish which task a. separating the fragments by size
B. cutting the fragments into smaller pieces at specific locations
C. separating the fragments into two groups, based on electric charge
D. identifying the fragments that end in specific nucleotide sequences

The hematodinium parasite becomes less of a problem for the blue crab when the crab is very young. fishing is thriving in the region. the crab moves to less salty water. a significant percentage of the population is impacted.

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

Which statement best explains why cells were observed in more detail using a compound microscope than a simple microscope? a compound microscope has greater magnification ability than a simple microscope. the compound microscope was invented before the simple microscope. a compound microscope is much easier to manufacture than a simple microscope. compound microscopes were more common than simple microscopes.