Well because they do.
Spiders are very proficient at reproducing. Some lay as few as ten eggs, while others can lay up 1,500 eggs.
The vast majority do. There are very few species of egg laying fish that do not lay their eggs in water.
Most species lay eggs once a year (though this can be several batches of eggs over a few day period) other fish can lay eggs every few weeks or every few months.
they dont Leather Back Turtles lay up to 80 eggs each
They lay thousands of eggs, but only a few will survive. The eggs are common food for other predators in the ocean.
Very few mammals lay eggs, the only examples are monotremes. No test has been carried out to find which is the strongest
Cockroaches apparently DO lay eggs. they lay a very large quantity of eggs per week/month
A few years
A female moth can lay anywhere from a few dozen to several hundred eggs at a time, depending on the species.
They lay lots of eggs - but not very often (once a year is common).
An eel does not feed its baby. The eel will just lay its eggs & don't bother about them. When the baby eels hatch from their eggs, they have to find their own food. Only a very few get to survive. That is why eels are very few to be found.
triops nearly always tend to lay eggs in sand, mostly because they like digging in it. very little do they lay eggs in gravel.