Pilots adjusted their flight path because the freezing level over the mountain had dropped unexpectedly overnight.

Primary producers occupy the lowest trophic level, supporting a variety of herbivores and higher predators.

We toured a split-level house where the living room sits a half-flight above the kitchen, connected by a short run of stairs that gives each space a distinct character.

They bought a split-level near the park because they liked the separate living and sleeping areas.

This camera is an entry-level model that still delivers impressive image quality.

Her level-headedness during the crisis reassured everyone and allowed the team to focus on solutions.

At cruising altitude, the pilots requested a higher flight level to avoid turbulence.

The central bank monitors the price level closely to determine whether inflation-targeting measures are necessary.

We set the significance level at 0.05 before running the experiment to limit the chance that random variation would be mistaken for a real effect.

Researchers measured nutrient flow across multiple trophic levels to understand ecosystem dynamics.