He most important source of food are plants, sea food, agriculture and husbandry.

not plants .major source is sea food over 60% food consume in earth daily
plants are the major sources of food as animals eat them and we eat animals inn seas also there are underwater plants
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The sources of food are mainly plants. They are the universal producers of food. But for humans, plants and animals are sources of food nowadays. There are certain plants which is entirely edible. Other plants yield fruits and vegetables which are edible.