(ǝ kwä tik): Growing or living in or often found in water.

(ka nə pē): A protective covering: such as, the uppermost spreading branchy layer of a forest.

(kǝn trōl): A variable factor that has been kept constant and which is used as a standard of comparison to the experimental component in a controlled experiment.

(kō ȯrd nət): Any of a set of numbers used to locate a point on a line or surface or in space.

(də brē): The remains of something broken down or destroyed.

(i kä nǝ mē): A system relating to the production, distribution, and consumption of goods and services in a country, area, or period.

(ē kō sis tǝm): A system made up of an ecological community of living things interacting with their environment especially under natural conditions.

(i rō zhǝn): The process of deteriorating or disappearing by wearing away.

(ha bә tat): The place or environment where a plant or animal naturally or normally lives and grows.

((h)ər bə sīd): A substance used to destroy or slow plant growth.

(in vā siv): Tending to spread especially in a quick or aggressive manner, such as a nonnative species growing and dispersing easily, usually to the detriment of native species and ecosystems.

(lēf li tər): Dead plant material, like leaves and twigs.

(nā tiv): Living or growing naturally in a particular region.

(pre və lənt): Widespread.

(prə dək tiv): Having the quality or power of producing especially in abundance.

(ran dǝm lē): So that each possibility has a definite and especially an equal probability of occurring.

(rə per ē ən): Relating to or living or located on the bank of a natural watercourse (such as a river or sometimes a lake or tidewater).

(se dǝ mǝnt): Material deposited by water, wind, or glaciers.

(tran zi shən): A changing from one state, stage, place, or subject to another.

(ǝn dǝr stȯr ē): The plant layer, especially the trees and shrubs, between the forest canopy and the ground cover.