Xylem and phloem are the two vascular tissues that form a plant’s internal transport system, moving water, minerals.

Pangaea was a supercontinent that contained nearly all of Earth’s landmasses, existing as a single continent until it began to break apart roughly 200 million y

A trophic level is a feeding step in a food chain, defined by how many transfers separate an organism from its original energy source.

Local scale is the level of geographic analysis that concentrates on a specific small area like a neighborhood or town, allowing geographers to study place-base

Kinetic energy is directly proportional to an object’s mass and the square of its velocity, captured by the formula KE = ½mv².

In Homer’s The Odyssey, hubris is excessive pride that leads characters to defy the gods and ignore wise counsel, causing dire consequences.

Flexibility is the ability of a joint or series of joints to move through an unrestricted, pain-free range of motion, and minimum ranges are needed to maintain

Electromotive force in chemistry is the maximum potential difference between two electrodes when no current flows.

District 11 is the agricultural heart of Panem, supplying the Capitol with fruit, grain, and cotton while its own people face harsh poverty.

Control theory in criminology flips the usual question about crime on its head — instead of asking why people break the law.