Examlex
The short, hair-like structures that propel Paramecium through the water are called
Endocrine System
Organ system involved in the coordination of body activities; uses hormones as chemical signals secreted into the bloodstream.
Altruism
Social interaction that has the potential to decrease the lifetime reproductive success of the member exhibiting the behavior.
Dominance Hierarchy
A social structure within a group of animals where individuals are ranked according to their level of dominance or power.
Pheromones
Chemical signals released by an organism that influence the behavior or physiology of other members of the same species.
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