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mixas84 [53]
3 years ago
6

Keeping doors and windows closed helps the environment because ___.

Biology
1 answer:
horsena [70]3 years ago
7 0
A makes the most sense, though D could actually be an Ok reason, the other two aren't reasonable, a fire safety action? The door would be better open in a fire emergancy, it makes a quicker escape
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A scientist researching salamanders has obtained two different specimens. Under what conditions would he classify them as belong
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Which phrases describe radioactive elements? Check all that apply.
svp [43]

A radioactive element is an element which is subject to spontaneous degeneration of its nucleus followed by the emission of alpha, beta and gamma particles. All elements with atomic numbers greater than 83 are radioactive.

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They have a half-life that determines their rate of decay.

Explanation for other options:

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denpristay [2]

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