Classwork Exercise and Series (Social Studies-JSS2): Harmful Substances
Meaning of Harmful Substance Harmful biological substance” means a bacteria, virus or other microorganism or a toxic substance derived from or produced by an organism that can be used to cause death, injury or disease in humans, animals or plants. Harmful substance are elements that are dangerous to human health. They are water, fruits, […]
Classwork Exercise and Series (Social Studies-JSS2): Harmful Substances Read More »
