A _____________ is a physical structure or behavior that better allows a species to survive.

The process in which organisms of a species are most adapted to their environments have a better chance of surviving to reproduce is called

A change in the DNA of an organism is called a

A group of similar organisms which can breed and produce fertile offspring is called a(n)

______________ are sections of DNA, which make up tightly wound structures called ___________________.

Every organism's DNA includes just __________ chemicals.

Members of the same species in the same location at the same time is called a

The large toe pads of the large green anole is an example of a(n)

_____________ traveled to the Galapagos islands during his voyage on the HMS Beagle and found several variations of finches with uniquely shaped beaks.

The non-venomous Californian king snake bears a very similar appearance to the deadly coral snake. This is an example of

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