What is a prairie in biology? Please don't look it up.
Thanks!

An extensive tract of level or rolling land, destitute of trees, covered with coarse grass, and usually characterised by a deep, fertile soil. They abound throughout the Mississippi valley, between the Alleghanies and the rocky mountains. From the forests and the prairies, From the great lakes of the northland.

Explanation:

it is either c or d and i know for sure it is not a or b

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.