The level of ecological organization that incorporates abiotic factors is the

A) community.
B) ecosystem.
C) population.
D) species.
E) symbioses


Answer: B) ecosystem.

Biology & Microbiology

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The layer of the vertebrate eye where photoreceptors are located is the:

a. lens b. cornea c. pupil d. iris e. retina

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Which chemical is used to stop mitosis in metaphase?

a. AZT b. histamine c. UV light d. eosin e. colchicine

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Which of the following gymnosperm groups has the most efficient water-conducting cells?

a. Coniferophyta b. Ginkgophyta c. Cycadophyta d. Gnetophyta e. Pteridophyta.

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Distinct regions of a protein that fold independently of one another are called:

A) domains B) alpha helices C) amino acids D) hydrophobic E) side chains

Biology & Microbiology