7. Fill in the blanks:
(a) The insects, butterflies, honeybees and birds help flowering plants in_________ .
(b) A forest is a purifier of______ and________ .
(c) Herbs form the___________ layer in the forest.
(d) The decaying leaves and animal droppings in a forest enrich the______________.
.
(a) The insects, butterflies, honeybees and birds help flowering plants in pollination.
(b) A forest is a purifier of air and water.
(c) Herbs form the lowest layer in the forest.
(d) The decaying leaves and animal droppings in a forest enrich the soil.
.