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Crossword- Sara fike

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