This document defines and provides pictures of various biology terms including: - Autotrophs, which are organisms that produce their own food from inorganic materials and are at the bottom of the food chain. - Conifer and deciduous leaves, with conifer leaves being needle-like to hold water in colder climates, and deciduous leaves changing color and falling off trees seasonally. - Mutualism, which is a beneficial relationship between two organisms. - Additional terms like exoskeleton, pollen, lichen, insect, heartwood, long-day plant, pollinator, and others.