Answer
C) Viruses need a host to survive
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They can alter the phenotype of an organism
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Some examples of limiting factors are biotic, like food, mates, and competition with other organisms for resources. ... Others are abiotic, like space, temperature, altitude, and amount of sunlight available in an environment. Limiting factors are usually expressed as a lack of a particular resource.
Biodiversity is the variation of life forms within a given ecosystem.
