Bacteria •Part of a classification system that divides all living things into six kingdoms. Kingdom Bacteria includes microscopic single-celled organisms found in many environments. Bacteria can be associated with disease in other organisms.
Fertilization •Part of the process of sexual reproduction in which a male reproductive cell and a female reproductive cell combine to make a new cell that can develop into a new organism
Simple Machine •One of the basic machines on which all other mechanical machines are based. The six simple machines are the lever, inclined plane, wheel and axle, pulley, wedge, and screw.
Zebra •any of several horselike African mammals of the genus Equus, each species having a characteristic pattern of black or dark-brown stripes on a whitish background: all zebra species are threatened or endangered.