Karen is studying an area that has many trees and goes through all four seasons. the trees lose their leaves as the seasons progress. which biome is she studying? deciduous forest grassland desert topical rain forest

The right option is; deciduous forest

The biome she is studying is deciduous forest.  

Deciduous forests are forests that are occupied by the trees that shed their leaves each year. Deciduous forests are usually found in areas that have warmer, wetter summers, and cold, frosty winters. The forests contain mainly broadleaf trees, such as maple, oak, beech, birch, poplar, and elm. The major regions in which deciduous forests can be found include; Denmark, East Asia, North America, and southern Sweden.

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.