Ecology is relationship between different organisms in a ecosystem
The answer is c. proteins
Binary fission is a form of asexual reproduction,which is mitosis, and is used by unicellular organisms. (And learn how to spell if you want to do science)
I believe the correct answer among the choices presented above is the last option. It is in the Sahara desert that most-likely there is physical water scarcity. This is because it is a desert and it is a characteristic of a desert to have very small or no amount of water. Also, the climate their is very hot.