The ____ is the number of individuals that die over a given time period.

An ___ is a species that has died out and has no living individuals.

Extinctions can be caused by predation, natural disasters, or damage to the ___.

___ is the instinctive seasonal movement of a population of organisms from one place to another. Many animals migrate to where food is more available.

Lack of food, natural disasters, disease, and predation are reasons why a population might ___ in size.

Human population growth can have negative effects on other ___.

A ___ is a species that is at risk but is not yet endangered.

When a population is in ideal conditions with unlimited resources, it grows in a pattern called ___.

During ___, as a population gets larger, it grows at a faster rate.

An ___ is a species whose population is at risk of extinction.

Improvements in water treatment and medical care have helped reduce human ___.

Humans commonly move from place to place, affecting the local ___ size.

Unlike other species, humans have developed ways to increase the ___ of their environment.