When was a microscope used to see blood capillaries in the tail of a fish

Marcello Malpighi was the person who used a microscope to see blood capillaries in the tail of a fish. He was a famous Italian scientist of the 17th century, and is known as 'the father of microscopical anatomy, histology, physiology, and embryology,' so he is definitely the correct answer

Explanation:

the answer to your question is:

c. complementary base-pairing

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