B11

The Amazon rainforest is one of the world's greatest natural resources. Also called Amazonia, it produces about a fifth of the world's oxygen.

 FIVE

B12

The name 'rainforest' is slightly misleading, because although it is very humid,

 LEAD

B13

it doesn't rain constantly in the forest.

CONSTANT

B14

The rainforest is home to thousands of animal and plant species, a product of millions of years of evolution.

 EVOLVE

B15

Most of these are not found on the forest floor but at a height of over 30 metres above the ground.

 HIGH

B16

This area high up in the branches of the trees is known as the canopy, and is only gradually becoming accessible to scientists researching the enormous variety of plants and animals that live there. Many people believe it is extremely valuable for the whole of our planet, and that the future of humanity depends on its survival.

 ACCESS