Wasps that reproduce by parasitism can inject just the right number of eggs into the eggs of various insects suitable for their offspring. If it injects too many eggs into the host's eggs, its larvae will die because they do not get enough space and nutrition in the competition with each other; if too few eggs are injected into the larvae, the excess nutrients in the host eggs will spoil, which in turn will lead to the death of the larvae.
It can be concluded that the size of wasp eggs determines the survival rate of wasp larvae based on the information provided.