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| physical, or non-living, factor that shapes an ecosystem |
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| rain containing nitric and sulfuric acids (pH less than 6) |
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| energy-requiring process that moves material across the cell membrane against a concentration difference |
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| inherited characteristic that increases an organism's chance of survival |
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nitrogen base, purine, part of a nucleotide
bonds with thymine in DNA
bonds with uracil in RNA |
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| process that requires oxygen |
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| medium used in a petri dish to grow bacteria |
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one of the number of different forms of a gene
example: B=brown |
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compound with an amino group on one end and a carboxyl group on the other end
20 essential amino acids |
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| when organisms die, decomposers return nitrogen to the soil as ammonia |
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