Ques:Q: Most of the heat that enters the mesosphere comes from where? Choices: - Earth's surface - Exosphere - Troposphere - the stratosphere A:

Ans:the stratosphere
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Ques:Q: Clearing land for agriculture and development is a major cause of what negative result? Choices: - water destruction - human destruction - mineral destruction - habitat destruction A:

Ans:habitat destruction
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Ques:Q: Most chromosomal disorders involve which chromosomes? Choices: - autosomes - ribosomes - protosomes - sex chromosomes A:

Ans:sex chromosomes
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Ques:Q: How many pairs of chromosomes are found in human cells? Choices: - 25 - 24 - 13 - 23 A:

Ans:
23
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