Natural selection leads a process of change in a population over time

Has regulatory areas for thirst, hunger, body temperature, water balance, and blood pressure

Why do some dna fragments move farther than others during gel electrophoresis? a. because their shapes are different b. because they are different types of molecules c. because the samples are different colors d. because their masses are different

Babies with very low or very high birth weight are less likely to survive. observe a graph of the data.