We live in a world filled with living organisms, which vary greatly in their structure and function.
These living organisms may range from tiny, microscopic and sub-microscopic plants and animals like, bacteria, virus and amoeba to large multicellular organisms, like the giant oak, the whale or the hippopotamus.
All living organisms have certain characteristic features but for convenience they are broadly classified under two major groups- plants and animals.
Plants are considered vital for existence because they prepare their own food by the process of photosynthesis.
All other organisms depend directly or indirectly on plants for their nutrition.
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