Examlex
Both the placenta and the corpus luteum produce the hormone relaxin during pregnancy.
Learning
The process of acquiring new, or modifying existing, knowledge, behaviors, skills, values, or preferences through experience or education.
Nervous System
Organ system of humans that includes the brain, spinal cord, sense organs (eyes, ears, etc.), and associated nerves. Receives, integrates, and stores sensory input; coordinates activity of other organ systems.
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.
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