It protects the Earth from becoming over heated, but with pollution, global warming has become more apparent because of the destruction of the ozone layer
A housekeeper I think , that's the answer
The answer is a simple radial nervous system.
Echinoderms do not have brains. Around their mouth, they have central rings from which nerves radially run into arms and along the body. Movement is controlled by the branches of those radial nerves.
I believe that hair and limbs are homology because all mammals have hair and similar limb structure. Hair loss and social behavior on the other hand are homolasy because not all mammals have them. Homology is the similar traits due to common ancestry while homoplasy is similar traits for other reasons other than common ancestry.
Process of photosynthesis makes glucose. Excess glucose is stored as starch, or made into cellulose in cell walls.
