Question

The rainforest contains half of the Earth’s wildlife and at least two thirds of its plant species. It can hold great quantities of water and is very important to the planet’s water cycle. Rainforests remove vast amounts of CO2 from the atmosphere and replace it with oxygen. Which of the following statements best summarize the above information about rainforests?
a.
The majority of the planet’s oxygen is generated from the rainforest.
b.
Two-thirds of all plants originated from the rainforest.
c.
The rainforest is a major catalyst for the planet’s water cycle.
d.
The rainforest is important to life as a whole on the planet.

Answer 1

d. The rainforest is important to life as a whole on the planet.

Reason: the passage highlights biodiversity, water-cycle role, and oxygen production—a broad importance to life. (a and b are too specific/unsupported; c is true but narrower.)