Old and new species

?
We don't know when life began because there is little trustworthy ?
evidence
1 of 6
what are the remains of organisms from long ago, found in rocks
fossils
2 of 6
many species have evolved and become ?
extinct
3 of 6
new species arise when two populations become ?
isolated
4 of 6
in an isolated population, ........... that increases the chances of survival are selected
alleles
5 of 6
what occurs when the populations become so different they cant interbreed
speciation
6 of 6

Other cards in this set

Card 2

Front

what are the remains of organisms from long ago, found in rocks

Back

fossils

Card 3

Front

many species have evolved and become ?

Back

Preview of the front of card 3

Card 4

Front

new species arise when two populations become ?

Back

Preview of the front of card 4

Card 5

Front

in an isolated population, ........... that increases the chances of survival are selected

Back

Preview of the front of card 5
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