When a sperm and an egg unite , they form a zygote
Answer:
Penicillin is an antibiotic isolated from growing Penicillium mold in a fermenter. The mold is grown in a liquid culture containing sugar and other nutrients including a source of nitrogen. As the mold grows, it uses up the sugar and starts to make penicillin only after using up most of the nutrients for growth.
Explanation:
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The cornea is the only part of the eye that touches air.
