ANY CHANGE IN THE ENVIRONMENT CANCAUSE A REACTION.
ASEXUAL REPRODUCTION OCCURS WHEN ONLY ONE ORGANISM IS REQUIRED.
ANIMALS USE THEM TO DETECT SOME STIMULI.
ARE OBTAINED FROM THE ENVIRONMENT AND TRANSFORMED INTO ENERGY.
THEY CAN´T PRODUCE THEIR OWN FOOD.
THEY FEED ON THE REMAINS OF DEAD PLANTS AND ANIMALS.
