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Which body structure describes the freshwater hydra?
Laughter
A vocal expression of emotion, typically associated with happiness, amusement, or relief, often serving as a social bonding mechanism.
Experimental Study
A research method involving the manipulation of variables to establish cause and effect relationships.
Correlational Research
A type of study that examines the relationship between two or more variables to determine if a statistically significant association exists.
Cause And Effect
The principle or concept that an action or event will produce a certain response or outcome in the form of another event.
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