Answer:
A Biotic factors are the living parts of an ecosystem.
The abiotic factors in an ecosystem include all the nonliving elements of the ecosystem.
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The DNA molecule is a double helix, shaped like a twisted ladder.
(C)theories can be used to predict the existence of as of yet unobserved things or phenomena
Aids/ HIV
Cancer
The only thing that is a great weekend too many
Answer:
The feeding relationships among the species in a community determine the community's trophic structure. C)