3. Use the list below to write the correct term for each definition below.

adaptation
extinct
gene
Darwin
fittest
mutation
evolution
fossils
natural selection

a. A change in genes that causes a change in a particular trait
b. Describes a species that no longer has any living representatives

c. A trait that a species develops over generations which helps it to survive

d. a unit of DNA that
determines a specific trait in the organism

e. The survival of organisms best fit for the environment

f. Changes in living things over time

g. Remains of organisms that lived in the past

h. Best suited to survive in its environment

L. The biologist who developed and offered evidence of the theory of Natural selection