(b) Animals cannot make their own food and so depend on other organisms for food and on plants for the supply of oxygen.
(c) Some organisms depend on other organisms for food, shelter or protection
(d) Microorganisms such as bacteria help to decompose dead organisms. The decomposition releases minerals into the soil which in turn become nutrients for plants.
(e) some insects such as bees and butterflies obtain food like pollen and nectar from flowers. In the process of obtaining food, these insects help in the pollination of flowers.