13. D
14. A
15. C
16. B
17. F
18. E
The answer is a. troposphere, stratosphere, mesosphere, ionosphere
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Solids maintain their shape, whereas fluids do not because <span>the molecules in solids maintain a regular pattern and only vibrate, or move very slowly. The correct option among all the options that are given in the question is the last option or option "d". I hope the answer has come to your help.</span>