When do animals cooperate with one another?

a.) when the costs outweigh the benefits

b.) when the costs equal the benefits

c.) when the costs are less than the benefits

Earth's sysems can interact quickly or over long periods of time. Give two examples of how Earth can change quickly and two examples of how it changes ovr long periods of time.

How do humans add nitrogen to the biosphere

Think about an igneous rock at the top of a mountain. If this rock went through the whole rock cycle, number the steps that would follow.

List 4 food chains from the food web to the right

In the cells of some organisms, mitosis occurs without cytokinesis. This will result in a. cells with more than one nucleus. b. cells that are unusually small. c. cells lacking nuclei. d. cell cycles lacking an S phase

Change in the genetic characteristics of a population from one generation to another is called

The process by which natural forces move weathered rock and soil brim one place to another is called

Describe how testosterone production is associated with puberty in males.

Macromolecules that contain carbon, hydrogen and oxygen in a 1:2:1 ratio is called?

How might a dramatic decrease in vegeta-tion lead to a decrease in a prey species? (Hint: Think of how the vegetation, prey, and predator could be connected in a food chain.)