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erma4kov [3.2K]
4 years ago
7

How long has Earth been in its current era?

Biology
2 answers:
taurus [48]4 years ago
6 0

Answer:

65 million

Explanation:

Elenna [48]4 years ago
3 0

Answer:

65 million

Explanation:

A P E X trust me

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3 years ago
An element has a half-life of 30 years. If 20 mg of this element decays over a period of 90 years, how many mg of this element w
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2.5 mg

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<em>The half-life of a substance is the time required for one half of the substance to decay. In order words, it is the time it will take for a substance to decay into  half of its initial size.</em>

For a 20 mg element with a half-life of 30 which decays over a period of 90 years;

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The second 30 years, the remaining 10 mg would have decayed to 5 mg

The third 30 years, 5mg would have decayed to 2.5 mg.

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What kind of mimicry is it when houseflies try to imitate wasps?
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