If You Have 2 Mice and They Mate, How Many Will There Be by the End of the Year?

This illustrates exponential growth, though real-world factors limit it.

Under ideal conditions, mice reproduce quickly—females can have litters every 20–21 days and mature in about 6 weeks. However, limited resources, predators, and disease keep populations in check.

A simplified model might show rapid increase, but actual growth is far more complex and constrained by the environment.