This document contains definitions for various science terms related to tools, measurements, experiments, matter, energy, Earth science, life science, and ecology. It provides explanations of concepts such as the scientific method, the states of matter, energy transformations, ecosystems, and adaptations.

51. Reflection occurs when light changes direction as a result of “ bouncing off ” a surface like a mirror.

53. Telescope: Light Refraction

85. A part of the ecosystem that is alive .

89. Bear Human An individual living thing

92. The movement of carbon dioxide and oxygen between organisms and the air.

93. A continuous process that renews the fresh water on Earth. The individual parts are called evaporation, condensation, precipitation, run-off, and transpiration.

94. The process that turns nitrogen gas in the air into usable substances that plants and animals can use.

97. The early immature stage that follows the egg stage in an insect’s life cycle.

113. An animal that eats only plant products.

117. An organism that makes its own food.