Sludge

A. is a byproduct of sewage treatment.
B. may be a source of pollution.
C. takes up space in a landfill.
D. All of the choices are correct.


D. All of the choices are correct.

Biology & Microbiology

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The organelle that is compared to a whip is a

a. microfilament. b. basal body. c. microvillus. d. flagellum. e. microtubule.

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In a severe allergic reaction, a person's tongue can swell up, effectively blocking the air passageways. An emergency procedure can be performed to restore airflow

Basically, a hole is cut into the passageways below the blockage to allow air to flow into the lungs. What passageway would be best for the surgical hole?

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