D) Atom... is the right option
A place where animals and plants are protected is an ecosystem
If the earth did not rotate on its axis then the atmosphere would only circulate on its poles and the equator in a simple back and forth pattern.
Fever indicates that your body's immune system is doing its job because of two key reasons. One is due to the fever creating a "speed up" in white cell production and the other is due to the fever actually destroying harmful bacteria.
Haploid refers to the presence of a single set of chromosomes in an organism's cells.
