The correct answer is B. Deserts are located in two bands: one north and one south of the equator.
Explanation:
A desert is a land area with very sparse rainfall and often high evaporation, which consequently has no or very sparse with vegetation. Animals and plants in the wilderness are often highly specialized and must withstand both high and low temperatures as well as coping with little water or uneven access to water. Deserts are found at the Earth's tropics, both north and south of the equator, along the western coasts of the continents and in areas with rain shadow. In addition, there are cold or polar deserts in the Antarctic and the northernmost parts of the Arctic. The most famous desert is the Sahara in northern Africa. Deserts exist on five continents and cover about one fifth of the earth's surface.
A gene is the basic physical and functional unit of heredity. Genes are made up of DNA. Some genes act as instructions to make molecules called proteins.
There are several good mutations that have ensured the survival of species. Typically helpful mutations help the creature adapt to its environment or protect itself from predators.
