___ seeks to determine the age of a fossil using radioactive isotopes.

Having similar _____ is a strong indicator that organisms share a common ancestor.

Identifying DNA sequences through _____ has helped to identify and better understand similarities in DNA sequences across species.

In terms of evolution, or change, it is the ____ that changes not the ____.

The genetic shuffling that takes place during _____ and sexual reproduction introduces new gene combinations within a population.

A _____ is a group of interbreeding organisms (one species) that lives in the same place at the same time and competes with each other for food, water, shelter, and mates.

The accumulation of mutations within a population over time can result in changes to the _____.

The process of increasing the frequency of beneficial alleles in the population while decreasing the frequency of deleterious alleles is called _____.

Sometimes, structures exists in organisms with no explained function. Scientists view these structures as left over (residual) parts from a past ancestor. The unused structures are called _____ structures.