Fish eggs that are fertilized externally are typically clustered and covered in a thick jelly-like substance. what is most likely the function of this substance

im not sure about the answer but

Explanation:

in external fertilization, the mother gives birth to eggs.  The male fish then puts sperm on the eggs.

In internal fertilization, the mother keeps the fish in her body until the fish is able to live on its own.

I hope this helps :)

answer; procedural justice;