Which of the following statements best characterizes farming in the sahara?

a. there is no farming at all in the sahara.

b. there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.

c. there are no sources of irrigation, so people in the sahara depend on rainfall to water their crops.

d. there is widespread farming throughout the sahara region, as the climate is well suited for growing crops.

B.There are isolated pockets of farming, generally around rivers and oases,

Explanation:

which are used for irrigation.

there are two main types of historical sources: primary sources and secondary sources. a primary source is something that originates from the past. it can be a chronicle, a piece of pottery, or even a piece of glacial ice that gives us climate data about the levels of atmospheric carbon one thousand years ago.

254.34

step-by-step explanation:

the formula for area of a circle is given by

a = pi * r^2

a = pi * 9^2

a = 81*pi

using 3.14 as an approximation for pi

a = 3.14*81

a = 254.34