When the amount of water in soil exceeds what the pore space can hold, the soil is

Pacific salmon migrate upstream and after breeding, soon die. They are termed

Animals that generate body heat metabolically at some times and from the environment at other times are referred to as ________.

The demographic age pyramid of a rapidly growing population is

Air masses are deflected to the ________ in the Northern Hemisphere.

Many plants adapted to arid environments use the ________ photosynthetic pathway to fix CO2 during the night.

Social dominance can serve to

The ________ point is the stage at which the moisture level in soil decreases to a level at which plants can no longer extract water.

Explain why seasonal changes in temperature and daylight occur and why they are more pronounced at temperate and polar latitudes than at tropical latitudes.

________ is the differential success of individuals in a population in response to environmental conditions.