What do we call the sudden and extreme changes taking place during the development of an animal?

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A tadpole develops into an adult frog by the process of

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The number of nuclei present in a zygote is

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Oviparous animals give birth to young ones.

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Each sperm is a single cell.

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External fertilisation takes place in frog.

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A new human individual develops from a cell called gamete.

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Egg laid after fertilisation is made up of a single cell

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Amoeba reproduces by budding.

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Fertilisation is necessary even in asexual reproduction.

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Binary fission is a method of asexual reproduction.