The answer is letter a. Being subjected to immense heat and the experience of pressure due to being far below the Earth's surface can change igneous or sedimentary rocks to metamorphic rocks.
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Answer:
<em><u>Calcium carbonate </u></em>
Explanation:
<em>Coral reefs are made of thin layers of calcium </em><em>carbonate</em><em>. </em>
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<em>U</em>
White blood cells make up approximately 1% of the total blood volume in a healthy adult, making them substantially less numerous than the red blood cells at 40% to 45%.
The operon is effectively the center of transcriptional control. In addition to its main structural genes, the operon houses an operator and a promoter. In front of the promoter lies a regulatory gene that produces repressor proteins. When a repressor is in its active state, it binds to the operator.
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