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Evolution

Author: Crossword
Across
The gradual process by which heritable traits become either more less common.
When a species of animals dies out because they don't have the traits that enable it to survive.
Behaviors that allow an organism to have a better chance of survival.
A change in a population's trait overtime.
A historical sequence of life indicated by fossils found in layers of the Earth's crust.
Period between the birth of one generation and the birth of the next.
Scientist that developed the modern theory of evolution.
Down
The process where 2 populations become so different they can no longer interbreed.
The most specific group of organisms that can mate with one another to produce offspring.
Each species produces more offspring then will survive to maturity.