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Spring Semester Review

Name_______________________________
Date________________________________
Across
A characteristic that improves an individual's ability to survive and reproduce in a particular environment
Any difference between individuals of the same species
All alleles in all individuals of a population
Fossils in which minerals replace all or part of an organism
Structures in different species that are similar because of common ancestry
Inherited traits that cause organisms to survive and reproduce
A group of similar organisms that can breed and produce fertile offspring
Old, eroded rock in contact with new
Pure substance made of only one kind of atom
Organisms produce more offspring than can survive
Down
Process by which unstable atoms change into another element
Extremely thin black imprint on rock
Shows relationship between organisms based on presence or absence of certain traits
Oldest rock on bottom, youngest on top
Struggle between organisms to survive in a habitat with limited resources
Actual number of years
Gradual change in a species over time
Particular preference that is personal not scientific
A group of individuals that belong to the same species and live in the same area