Define harmful substances in farming​

Harmful chemical substance" means a solid, liquid, or gas that through its chemical or physical properties, along or in combination with one or more other chemical substances, can be used to cause death, injury or disease in humans, animals or plants.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.