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forests serve as green _____ and _____ purifying systems in nature.
#1. 1st____
#2. 2nd_____
#3. forest provides a ____ for many animals and plants.
#4. The branches of the tall trees look like a roof over the other plants in the forest. this is called a ____
#5. Trees had crowns of different types and sizes. These had created different horizontal layers in the forest. These are known as _____
#6. mushroom and other micro-organisms feed upon the dead plant and animal tissues and convert them into a dark coloured substance called ____
#7. The micro-organisms which convert the dead plants and animals to humus are known as _______.
#8. The dead animals become food for _____
Select all that apply: