Dominance hierarchies minimize aggression in social animals
Indicate whether the statement is true or false
TRUE
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In a classic experiment, Otto Loewi stimulated the vagus nerve of a frog heart electrically. He let the fluid bathing the heart he was stimulating flow to and thus contact a second, nonstimulated heart. Both the first and second hearts slowed down with this stimulation. Based on this response, you can assume the nerve he stimulated was part of the
A. parasympathetic system. B. sympathetic system. C. somatic system. D. atrioventricular system. E. central nervous system.
The seeds of many plant species are dispersed by a harmless temporary attachment to an animal's fur or feathers. This form of dispersal is known as
A. ectoparasitism. B. amensalism. C. mutualism. D. phoresy. E. trophic mutualism.
Polar molecules are composed of covalently bonded
A. atoms of different electronegativity. B. ions. C. atoms of identical electronegativity. D. identical atoms. E. carbon atoms.
Our closest-living relatives on the evolutionary tree are
A. bonobos and common chimpanzees. B. Homo erectus. C. orangutans and gibbons. D. gorillas. E. Homo neanderthalensis.