How does an Earthworm grow?

The first stage is the coccoon. The second stage is the hatchling. The third stage is the full size earthworm.
Fertilized eggs are deposited in the soil in cocoons. Each cocoon produces an average of four eggs. Eggs hatch within three weeks. Earthworms burrow deep into the soil and come to the surface to feed on organic debris.
they live and then they die

An earthworm's life cycle is very long.
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