Is coral a type of rock?

coral is not a rock or a plant it is an animal

Explanation:

a single coral is made up of many tiny creatures that are called polyps, together they make up a coral.

No, We can't say Corals are rocks. Rocks are non-living components of the Biosphere whereas Corals are living.

They are some kinds of mounds which are formed by thousands of smaller or micro animals known as Polyps. They are invertebrates. When the outer skeleton of these animals hardens, it form coral reefs.

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where is the scientific experiment?

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.