I'm totally sure that this one is correct:
A.
Though unicellular, amoebas have all the necessary cell organelles and a well-defined nucleus, therefore fulfilling the characteristics of eukaryotes.
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<span>Harvey has had en episode of Gate-control theory. The gate control theory of pain asserts that non-painful input closes the "gates" to painful input, which prevents pain sensation from traveling to the central nervous system. Therefore in Harvey's case, his presentation was so stimulating to him that the experience and moment of it suppressed his pain momentarily.</span>
7. Heat
8. Coal
9. Silicon
11. Weathering
12. Chemical weathering
