a group of similar organisms that can mate with each other and produce fertile offspring

preserved remains or traces of an organism that lived in the past

a trait that helps an organism survive and reproduce

a well-tested concept that explains many observations

an effect caused by species producing more offspring then can survive

any differences in individuals of the same species

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Question	Answer
species	a group of similar organisms that can mate with each other and produce fertile offspring
fossil	preserved remains or traces of an organism that lived in the past
adaptation	a trait that helps an organism survive and reproduce
theory	a well-tested concept that explains many observations
overproduction	an effect caused by species producing more offspring then can survive
variations	any differences in individuals of the same species