What is the number of distinct stages in a frog's metamorphosis?


3

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Define sexual reproduction.


Reproduction in which a male and female are involved is called sexual reproduction. In this mode of reproduction the male and female gametes fuse together. 

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What are the animals called, who lay eggs first?


Oviparous animals.

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Define asexual reproduction.


Asexual reproduction is the mode of reproduction in which only a single parent is involved. 

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What is fertilization?


Fertilization is the fusion of male and female gametes to form a zygote. 

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