Discussion
Which of the following is a set of animals in which all show external fertilization ?
Answer: D
The set in which all show external fertilisation is Frogs, fish, starfish.
In external fertilisation eggs and sperm are released into water and fuse outside the body. Frogs and most fish release eggs and sperm in water, and starfish shed their gametes into the sea.
Hens, lizards and butterflies all have internal fertilisation, so any set containing one of them fails.
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