| Word | Definition |
| adaptation | (change in an organism to help it survive) |
| amphibians | (cold-blooded vertebrate, such as a frog, toad, newt, or salamander ) |
| cell wall | (outer boundary of cell) |
| cell membrane | (thin sheet or tissue that lines cells) |
| cytoplasm | (substance between the cell membrane and the nucleus) |
| nucleus | (a part of the cell containing DNA and RNA and responsible for growth and reproduction ) |
| condensation | (process by which a gas or vapor changes to a liquid
) |
| earth's layers | crust, mantle, core |
| edible parts of plants | parts of plants that are eaten |
| endangered | (threatened with extinction) |
| erosion | (process by which the surface of the earth is worn away by the action of water, glaciers, winds, waves, etc.) |
| evaporation | (changing of a liquid to a gas) |
| friction | (the rubbing of one object or surface against another
) |
| gravity | (the force which attracts things towards the Earth and causes them to fall to the ground
) |
| heredity | (the passing on of qualities, such as appearance and intelligence, from parents to children
) |
| lunar | (relating to the moon) |
| mammals | (class of vertebrates characterized by the production of milk by the females and in most cases, by a hairy body covering) |
| mixture | (combination of two or more substances that are capable of being separated) |
| solution | (a liquid containing a dissolved substance ) |
| moon phases | (new moon,first quarter, full moon, last quarter ) |
| parallel circuit | (a closed circuit in which the current divides into two or more paths before recombining to complete the circuit ) |
| pitch | (the degree of sound) |
| precipitation | (rain, snow, hail) |
| renewable resources | (resources that can be replenished) |
| non-renewable resources | (resources that cannot be replaced) |
| reptiles | (scaly, cold-blooded vertebrates, such as lizards, snakes, alligators, and turtles) |
| series circuit | (a path for electricity to flow through without braching out to other paths
) |
| simple machines | (lever, inclined plan, wheel and axle, screw, wedge, pulley) |
| solar energy | (energy from the sun) |
| threatened | (in danger) |
| thriving | (to make steady progess) |
| traits/characteristics | (distinguising features) |