The egg undergoes cleavage and forms:

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(D) Cleavage is a series of rapid mitotic divisions of the zygote. Following fertilization,the zygote undergoes cleavage to form a solid ball of cells

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All the above

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(D) Cleavage is a series of rapid mitotic divisions of the zygote. Following fertilization,the zygote undergoes cleavage to form a solid ball of cells known as the morula ($8-16$ celled stage). The morula further divides to form a hollow,fluid-filled structure known as the blastula (or blastocyst in mammals). Since both morula and blastula are stages formed during the process of cleavage,the correct answer is $D$.

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