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Answer:

Across
1Physical or chemical _____ in the internal or external environment
4One representation of a predator-prey _____ between species within an ecosystem or habitat
7Location in sedimentary rock layer _____ age
8A trait that all life forms must _____
9What is Cellular _____?
Down
2The shape that two linear strands of DNA _____ when bonded together
3Of descriptions or distinctions based on some quality _____ than on some quantity
5Makes food; autotroph; _____
6The region of the body of a vertebrate between the thorax and the _____
 
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