Paleontologists study the _________, which includes the fossils of organisms that lived in the past, to learn about how organisms have changed over time.

Measuring the body parts of different lizards to determine evolutionary relationships is an example of…

Scientists can better understand evolutionary relationships by comparing __________, which are unborn, developing organisms.

In natural selection, __________ relates the fact that in nature, more organisms are born than are likely to survive.

In natural selection, __________ describes differences that exist between members of the same species.

In natural selection, __________ determine what resources members of the same species must compete for.

In natural selection, __________ are an organism’s ultimate goal, resulting in the continuation of that organism’s genes into future generation(s).

Humans have shaped the evolution of racehorses and dogs through selective breeding. These are examples of _________.

___________ are changes resulting that enhance an organism’s the ability to survive or reproduce.

Biological _________ is how one organism changes over its lifetime .

________ is how species gradually change over long periods of time.

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