Question

give reason. why do animal exhibiting external fertilization produce a large number of gamates

Answer 1

because many of them will due and get destroyed in nature..... ONLY some will survive and fuse with Ovam.......❤️❤️❤️

Answer 2

There are lots of gametes released by certain kind of animals for ensuring excellent possibility of better fertilization.  

Since, these gametes are actually laid in various water sources, most of them are also carried away by the rain, moving water or wind.

It is essential to know that some of them are taken by the animals.  Hence, the large production of gametes is important.