An organism which someone wants to get rid of.

A chemical, synthetic or natural, which kills pests.

An expression for degree of acidity and alkalinity based upon the hydrogen ion concentration. The pH scale ranges from 1 to 14, pH of 7 being neutral, less than 7 acid, greater than 7, alkaline.

Toward the rear, back, or tail.

Complex molecule containing carbon, hydrogen, oxygen, and nitrogen, a major constituent of meat. Worms are approximately 60% protein.

Plural for protozoan, a one- celled organism belonging to the animal kingdom. Most protozoa live in water and can be seen only with a microscope. Some move by means of tiny hairs called cilia, others by a whip-like tail called a flagellum, and others by false feet called pseudopodia like amebas have.