Flatworms Have Complete Digestive Tracts

question 43

True/False

Flatworms have complete digestive tracts.

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Definitions:

Somnambulism

Also known as sleepwalking, a disorder that occurs during deep sleep, leading to walking or performing other complex behaviors while asleep.

Narcolepsy

A long-standing ailment involving extreme daytime sleepiness and unexpected sleep attacks.

Insomnia

A sleep disorder that is characterized by difficulty falling and/or staying asleep.

REM Sleep

A unique phase of sleep in mammals and birds, characterized by random movement of the eyes, low muscle tone throughout the body, and the propensity of the sleeper to dream vividly.