Examlex
Which one of the following is a characteristic of open circulatory systems but not closed circulatory systems?
freshwater Stickleback
A small fish found in freshwater environments, often used in studies of evolution, ecology, and behavior.
Bighorn Sheep
A species of sheep native to North America, known for its large horns and rugged mountain habitats.
Horn Length
A measure of the length of the keratinous projections found on the heads of certain animals, such as deer and cattle, often used in mating displays and defense.
Directional Selection
A form of natural selection where one extreme phenotype is favored over other phenotypes, leading to a shift in the population’s phenotype distribution.
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