Download Changing Populations

Name
Date
Class
C21L2
Content Practice A
LESSON 2
Changing Populations
Directions: On each line, write the term from the word bank that correctly completes each sentence. Each term is
used only once.
birthrate
carrying capacity
death rate
decrease
endangered species
exponential growth
extinct species
increases
migration
movement
threatened species
1. The number of offspring produced over a given time period is a population’s
; the number of individuals that die over that time is
its
.
2. If the birthrate is higher than the death rate, the population
in size.
3. A population grows in a pattern called
when it is in ideal
conditions with abundant resources.
4. Lack of food, natural disasters, disease, and predation are reasons why a population
in size.
5. When no individuals are left of a species, it is called a(n)
.
6. A(n)
is a species whose population is at risk of extinction.
7. A(n)
is a species that is at risk but is not yet endangered.
8. The instinctive seasonal movement of a population of organisms from one place to
another is called
.
9. Changes in the human population size are caused by birthrate, death rate,
and
.
10. Humans have developed ways to increase the
of their
environment.
30
Populations and Communities
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