Postulates

Life activities

________ " (struggle for existence) "determine which traits are favorable or unfavorable by determining the success of the individuals who possess the traits.

Natural selection

________ causes the accumulation of new variations and the loss of unfavorable variations to the extent that a new species may arise.

constant change

The environments of most organisms have been in ________ throughout geologic time.

individuals in a population are not all the same

some have heritable variations