Bees are very important for pollination of crops and according to a research the number of bees are decreasing very rapidly. There were almost 4.5 million bees in U.S.A in 1945 and now the number of bees have decreased to 2 million.
There is a special kind of bees known as “the bumblebee” which eats nectar and spread pollen in plants thus helps in cross-pollination in plants.
