Examlex
Which of the following statements about opportunity costs is true?
Reciprocal Altruism
A behavior in which an organism acts in a way that temporarily reduces its fitness while increasing another organism's fitness, with the expectation that this action will be reciprocated in the future.
Sparrow Song
The vocalization produced by sparrows, primarily used by males to attract mates and establish territory.
Laughing Gull Chicks
Young birds of the species Leucophaeus atricilla, known as the laughing gull, characterized by their distinctive calls that resemble laughter.
Pecking Efficiency
A measure often used in aviculture or poultry science to assess the effectiveness with which birds use their beaks to obtain feed.
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