Sedimentary rocks formed partially by animals and plants are called biogenic sedimentary rocks.

Here's why:

* Biogenic means "originating from living organisms."

* Sedimentary rocks are formed from the accumulation and cementation of sediments.

Some examples of biogenic sedimentary rocks include:

* Coquina: Made up of shell fragments cemented together.

* Chalk: Formed from the accumulation of microscopic marine organisms called coccolithophores.

* Coal: Formed from the accumulation of plant matter, primarily trees.

While these rocks are primarily formed from biological material, they can also contain other types of sediment.