First slide
Classification of Animals
Question

Reproduction takes place only by sexual means in

Easy
Solution

Reproduction takes place only by sexual means in ctenophores. 

Sponges reproduce asexually by fragmentation (also by budding) and sexually by syngamy (fusion of gametes).

Cnidarians like Hydra reproduce asexually by budding. 

Protozoans reproduce asexually by binary fission, multiple fission, etc.

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