Illnesses and conditions caused by factors in the environment are collectively called environmental diseases. Pesticides, chemicals, radiation, air pollution, and water pollution, are some of the manmade hazards that are believed to contribute to human illnesses.
Answer: in the closet; under the bed.
Explanation: 4 year olds understand that Bobby left the toy under his bed, hence he will go look for it there. In contrast, 2-3 year olds can't comprehend the thought process Bobby will go through, as well as the fact that Bobby is unaware that his mum moved the toy.
