What is a desert?

a.
a flat area covered primarily with sand

b.
an area of extreme heat year round

c.
an area that receives very little precipitation

d.
an area where there is rain during only one month of the year

A desert is a barren area of landscape where little precipitation occurs and, consequently, living conditions are hostile for plant and animal life.

so the answers are A and C

Explanation:

an angle + its complement = 90 degrees

it is very hard for the climatologists to precisely predict how will the global temperatures be changing so there's lots of models, some of which differ significantly, this is due to multiple factors, and probably the most important is the human activity.

humans have been a key factor in climate change around the globe since the start of the industrial revolution, and in the past few decades the consequences are becoming more obvious. there's lots of emission of pollutants in the atmosphere as well as changing the environment on the surface itself, so it's really hard to predict how will that go in the future because there's some countries that are reducing the damage and are going towards green energy, while others are stubbornly continuing with pollution and damages to the environment.