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Crossword- Grace Conant

Across
the movement genes over time.
one organism lives inside the other.
organisms are thought to have the same ancestor, separated over time.
change in allele frequencies
by which heritable traits increase an organism's chances of survival and reproduction. atural selection)
a chemical reaction occurs.
the separation of members of populations via physical barrier.
Naturalist, father of evolution
In biology usually refers to the heritable differences within a species.
process by new species form.
Examples of these are ammonites
Down
a scientific theory
birth weight.
the ability to survive to reproductive age
The termination of a species forever.
process which species form
enables all the organisms to survive.