Examlex
What part of a comet always points most directly away from the Sun?
A Drive
A drive is a psychological state that motivates an organism to satisfy a need, often critical for survival, like hunger or thirst.
Sleepiness
A state of strong desire for sleep, or sleeping for unusually long periods (compare with fatigue).
A Need
An essential requirement or necessity for survival, well-being, or the accomplishment of a task.
Homeostasis
The autonomous mechanism through which living organisms preserve equilibrium as they adapt to variations in their external environment.
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