Question

vegetation varies by region. the tropical rainforests are found around the equator where there is plenty of rainfall such as in the amazon basin. vegetation that stores water may exist in areas with extreme temperatures and very little precipitation such as the sahara. instead of trees, tall grasses grow plentifully in the sahel because of the drier conditions. which conclusion is best supported by this excerpt?
climate affects population distribution worldwide.
weather patterns and climate influence the type of biomes found in a region.
there is little difference in the climate patterns found in different regions.
altitude has an important effect on vegetation and crops.

Explanation:

The excerpt discusses vegetation and climate patterns. Altitude is not mentioned in the text, so the conclusion that altitude has an important effect on vegetation and crops is not supported. The text focuses on climate (rainfall, temperature) affecting vegetation (e.g., tropical rainforests near the equator, Sahel's drier conditions with grass instead of trees).

Answer:

Altitude has an important effect on vegetation and crops.