Receptors are groups of specialised cells. They detect a change in the environment stimulus. In the nervous system this leads to an electrical impulse being made in response to the stimulus. Sense organs contain groups of receptors that respond to specific stimuli.
Answer:
Decomposing
Explanation:
When bacteria starts to break down the dead matter from organisms, this is called decomposing
Because of the gradual change in habitat, modern horses developed rougher teeth, stopped walking on several spread out toes and developed hoofs, they started developing larger speeds, and numerous other things.