These pictures compare the numbers of prairie dogs in an area at two
different times. The picture on the right shows the area 10 years after the picture on the left.

Which statement best explains the change over the 10-year period?

A. The number of immigrants increased.
B. The carrying capacity increased.
C. The birthrate increased.
D. The number of emigrants increased.

In which of the following ways is the function of the surface of a microsphere similar to the function of an actual cell membrane? a. both make it possible for the conditions in the interior to be different from the conditions outside. b. both provide a barrier that keeps water from flowing across it so the interior remains dry. c. both separate the rna that forms in the interior from any rna that might form in the environment. d. both can actively move molecules into the interior or out into the surrounding environment.

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?

Cells must be in osmotic equilibrium with their surroundings environments because if they swell or shrink thier membranes will rupture