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B
Algae and other plant material
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C
mall aquatic invertebrates
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D
Leftovers thrown by man
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Solution
The correct option is B Algae and other plant material A tadpole (also called a pollywog) is the larval stage in the life cycle of an amphibian, particularly that of a frog or toad. They are usually wholly aquatic, though some species have tadpoles that are terrestrial. When first hatched from the egg they have a more or less globular body, a laterally compressed tail and internal or external gills. As they grow they undergo metamorphosis, during which process they grow limbs, develop lungs and reabsorb the tail. Most tadpoles are herbivorous.
So the correct option is 'algae and other plant material'.