Approximately how long does it take for lung cancer to occur in a smoker?

A. 5 years
B. 30 years
C. 20 years
D. 45 years
E. 10 years


Answer: B

Biology & Microbiology

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Argon has 18 protons. How many electrons are in its third energy level?

a. 2 b. 4 c. 6 d. 8 e. 10

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The element ________ is a basic constituent of all organic compounds and is involved in the fixation of energy by photosynthesis

Fill in the blank(s) with correct word

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In the United States, the largest group of endangered species is:

a. mammals. b. flowering plants. c. insects. d. birds. e. amphibians

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A basic difference between a prokaryotic cell and a eukaryotic cell is that the prokaryotic cell

A) is structurally more complex. B) lacks DNA. C) lacks a nucleus. D) is considerably larger. E) possesses membrane-bound organelles.

Biology & Microbiology