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Answer:

Across
1natural _____
3A symbiotic relationship _____ two organisms in which neither by themselves can exist without the other.
6Changes in the frequency of a gene in a population as a result of chance rather than of mutation, selection, or migration. Can be caused by an accident that leaves only a small _____ alive to reproduce.
Down
2The general concept is that the niche is a species' "profession" - what it does to make a living. The term is also used to refer to a set of environmental _____ within which a species is able to persist.
4A single unit of genetic information comprised of a complex segment of the four DNA base-pair compounds.
5The idea that 2 populations of different _____ with exactly the same requirements cannot persist indefinitely in the same habitat - one will always win out and the other will become extinct.
 
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