Soil scientists use the capital letters O, A, B, C, and E to identify the master soil horizons<span>, and lowercase letters for distinctions of these horizons. Most soils have three major horizons: the surface horizon (A), the subsoil (B), and the substratum (C). Some soils have an organic horizon (O) on the surface, but such a horizon can also be buried. The master horizon, E, is used for subsurface horizons that have a significant loss of minerals (eluviation). Hard bedrock, which is not soil, uses the letter R.</span>
Answer:
A novel GPCR role in regulating cell density sensing. Homeostasis modulation (e.g., water balance). Involved in growth and metastasis of some types of tumors. Used in the endocrine system for peptide and amino-acid derivative hormones that bind to GCPRs on the cell membrane of a target cell.
The removal of top predators affect mesopredator populations in that the geographical range and abundance of the mesopredators will increase. Top predators are the predators that eat herbivores and the mesopredators, therefore their removal would mean the mesopredators and the herbivores will not be predated and thus their population will increase.
I'm pretty sure its A bit of not its D, sorry but its kinda hard to tell :/
