2.  process through which species change over time.

3.  Nonliving factors in an organism’s environment  ex. Temperature, rainfall, sunlight

4.  living factors in an ecosystem.  Ex. Trees, insects, grass

5.  A characteristic or any inherited trait that makes a species better suited to survive and reproduce in its environment

6.  Natural environment in which a living thing gets all that it needs to live  Ex. Deserts, rainforest, coral reef, lake

7.  The process through which members of a species that are best suited to their environment survive and reproduce at a higher rate than other members of their species.

8.  One of several periods in Earth’s history when large numbers of species became extinct at basically the same time.

9.  A group of organisms of the same species.

10.  A natural process that involves a gradual change in the plant and animal communities that live there.

11.  a physical structure that was fully developed and functional in an earlier group of organisms but is reduced and unused in later species.

12.  The evolution of a new species from an existing one

13.  A change in an organism’s DNA

14.  A distant or early form of an organisms from which later forms descend

15.  The imprint or hardened remains of a plant or animal that lived long ago

16.  Factor or condition that prevents the continuing growth of a population in an ecosystem

17.  Separation of a population of organisms from related forms in such a manner to prevent crossbreeding

18.  The permanent disappearance of a species

19.  The study of the changes in the number of individuals in a population and the factors that affect those changes

20.  Maximum number of a species that an ecosystem can support

21.  Measure of the number of organisms that live in a given area  Ex. 15 rabbits per sq km

22.  Number of individuals of the same species that live in a given area

23.  Movement of an organism into a range inhabited by individuals of the same species

24.  Movement of individuals out of an ecosystem

25.  Species characterized by a relatively short life span, with relatively large numbers of offspring

26.  A species characterized by a relatively longer life span, with relatively few offspring, when compared with an opportunist species.

27.  The release of harmful substances into the air, water, or land.