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Life Science Vocabulary Quiz 2-27-2017

LIfe Science
Across
One of several periods in Earth's history when large numbers of species became extinct at the same time
A distant or early form of an organism from which current forms originated from
A characteristic, behavior, or inherited trait that makes a species able to survive and reproduce in a certain environment
The process through which members of a species that are best suited to their environment survive and reproduce at a higher rate the other members of the species
Down
A physical structure that was fully developed and functional in an earlier group of organisms but is reduced and unused in later species
The evolution of a new species from an existing species
The imprint of hardened remains of a plant or animal the lived long ago.
The process of which species change over time