A) Phenotype is an organism's genetic makeup behind the scenes.
I think the correct answer is the second option. The best isotope to be used in dating metamorphic rocks would be potassium-40. It is the most common and is widely appliclable since most of metamorphic rocks have potassium in it. The isotope system used is potassium-argon.
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Wind is caused by uneven heating.
This is because when the earth has been heated the hoa air become less denser and go up and the colder air replacea the hot air and tge circulation continues