The answer is B. Microevolution is simply a change in gene
frequency within a population over time. This change in genetic frequency could be attributed
to mutations, genetic drift, gene flow and natural selection. This change happens over a relatively short (in
evolutionary terms) amount of time as compared to in macroevolution where is where greater differences in the
population occur over time.
I suggest you watch the Amoeba Sisters video again, 1-2x and take notes.
Biomagnification is when toxins / heavy metal are present in small amounts in fish, but accumulate as you move into higher trophic levels. This is one reason why it can be toxic for humans to eat tertiary or quaternary consumers, such as swordfish, shark, etc.
Nucleus. The nucleus contains all the genetic material in a cell. This genetic information is called deoxyribonucleic acid (DNA). DNA contains all the instructions for making proteins, which control all of the body's activities.
