MCQ
Entamoeba histolytica infection occurs through
- ✓Contaminated water and food
- BSweat
- CBird droppings
- DMosquito bites
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$R$ : They act on all trophic levels of a food chains.
$R$ - The lower the $BOD$ of water, lower is its polluting potentials.
$I.$ Sucrose
$II.$ Inorganic Salts
$III.$ Amino acids
$IV.$ Vitamins