Why are deserts often only sparsely populated?
a. humans do not think deserts are attractive landscapes
b. a lack of rain makes it hard to grow crops or find sources of drinking water
c. the sand and rock of deserts make construction efforts difficult
d. deserts often do not have valuable natural resources like gold or oil

B. a lack of rain makes it hard to grow crops or find sources of drinking water

Explanation:

the answer is option c.

explanation:

recycled water alludes to the water that being utilized again after it already  used for farming purposes.   this kind of water frequently contains pharmaceutical gathering due to the compound compost that is utilized for the plants is consumed into the water.