habitat - n. the place or type of place where a plant or animal naturally or normally lives or grows

contamination - n. to make (something) dangerous, dirty, or impure by adding something harmful or undesirable to it

conversion - n. the act or process of changing from one form, state, etc., to another

pesticide - n. a chemical that is used to kill animals or insects that damage plants or crops

mismanage - v. to manage something badly

reclassify - v. to reorganize something