During the winter months, mountains are often covered with snow. In the spring, the snow starts to melt, and it runs off the mountains into nearby lakes. One year, there was less snow on a mountain than normal. The lake near the mountain had a lower water level that summer. How will this likely affect the lake habitat?
A.
The lake will freeze more easily in the summer.
B.
There will be more water for the fish to swim in.
C.
There will be less water for the fish to swim in.
D.
The temperature of the lake water will be lower.

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes

Which best describes the nucleus of an atom a. it is where all of the particle s of the atom are located b. it is the negatively charged part of the atom c. it is where the electrons and the protons are located d. it is the part of the atom with the greatest mass