This document defines and describes several biological terms in 1-2 sentences each. It defines fructose, annelid, angiosperm, lichen, keratin, insects, modified stems, tissue, and chitinous. The definitions provide the key characteristics or functions for each term, such as fructose being a sweet sugar found in fruits and honey, annelids being segmented worms, and tissues being aggregates of similar cells that perform specific functions.