<span> life and living organisms (so this includes both plants and animals) Botany - plants Zoology - animals Ecology - how living things interact with each other and the environment</span>
The correct option is C.
Homeostasis refers to the method by which living organisms regulate their internal environments. The conditions that surround the living cells has to be kept at the optimum level because the survival of the organism depend on it and this is what homeostasis does.
The reddish areas have that hue because infrared light has been translated into colours we see with our eyes, such that the shorter wavelength is blue and the longest are red.