In the Ocean,swimming Organisms That Can Move at Will in the Water

question 59

Multiple Choice

In the ocean,swimming organisms that can move at will in the water column are referred to as

• A)periphyton.
• B)zooplankton.
• C)megaplankton.
• D)nekton.

---

Definitions:

Circadian Rhythm

An innate, internal method that arranges the sequence of sleep and wakefulness, occurring approximately every 24 hours.

Hypnagogic Sensations

Experiences occurring at the onset of sleep, including visual, auditory, or physical sensations that can seem vividly real.

Alpha Wave

A type of brainwave detected by an EEG that occurs when a person is relaxed, but alert, typically with closed eyes.

Sleep-Inducing Hormone

Melatonin, a hormone produced by the pineal gland that regulates sleep and wakefulness.