Temperate forests are called deciduous forests because of the defining characteristic of the trees that grow there: they lose their leaves seasonally.

Here's a breakdown:

* Deciduous means "falling off at maturity," referring to the trees shedding their leaves.

* Temperate forests experience distinct seasons, including a period of cold weather when the trees go dormant and lose their leaves.

This is in contrast to evergreen forests, where trees keep their leaves year-round.

So, the term "deciduous forest" highlights the key characteristic of the trees in these forests, their seasonal loss of leaves.