Wastes will accumulate and most nutrients would stop cycling if the ____ in the ecosystem dies

a. algae
b. bacteria and fungi
c. parasitic consumers
d. insects
e. vertebrates


b

Biology & Microbiology

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Which of the following is an example of a connective tissue?

A) the surface of the skin B) nerves C) blood D) cuboidal epithelium E) smooth muscles

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The first living organisms appeared on Earth approximately

(a) 4.6 billion years ago. (b) 3.8 billion years ago. (c) 1 billion years ago. (d) 6400 years ago.

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Which one of the following is not a steroid that uses a type I receptor?

A. estrogen B. glucocorticoids C. thyroid hormone D. androgens

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In what phase of clinical trials are animals used?

A) Preclinical testing B) Phase I C) Phase II D) Phase III E) Post launch

Biology & Microbiology