Question

why is some animals lay egg
in large numbers

Answer 1

because only one or two egg grow up thats why they give a number of egg

Answer 2

$\bf\huge\color{red}\mathbb{HELLO\:USER:)}$

Some animals give eggs in large number because they know that there are many predators that would eat a lot of their eggs.

So, to continue their species' race they lay eggs in large quantities.