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Pachacha [2.7K]
3 years ago
10

Select all that apply. Ground water pollution can be caused by _____.

Biology
1 answer:
levacccp [35]3 years ago
4 0
Man-made products such as gasoline, oil, road salts and chemicals get into the groundwater and cause it to become unsafe and unfit for human use
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3 years ago
1) How is DNA compacted to form a chromosome?
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Answer: Answer is below in the explanation.

Explanation:

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(Link my school used https://www.biointeractive.org/classroom-resources/how-dna-packaged )

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4 years ago
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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
Vlada [557]

Answer:

2.5 mg

Explanation:

<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;

The first 30 years, 10 mg would have decayed, remaining 10 mg

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.

Hence, in 90 years, 20 mg of the element would <u>remain only 2.5 mg.</u>

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