Fish that quickly and accurately sense the location of a nearby motionless fish in cloudy water are probably using
A) electromagnetic receptors.
B) photoreceptors.
C) chemoreceptors.
D) pain receptors.
Answer: A
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Which two structures of the human digestive tract can be classified as endocrine glands since they
produce hormones?
a. liver and gallbladder b. liver and pancreas c. liver and small intestine d. pancreas and small intestine e. pancreas and stomach
Myrmechochores are ants that are attracted to the seeds of certain plants
Indicate whether the statement is true or false
Which scenario illustrates a homeostatic mechanism?
a. city buses transporting people from their houses to their jobs b. water stored behind a dam that is released to make electricity c. a thermostat keeping a house at 72 degrees d. a series of underground passageways connected to a large building e. the daily temperature variations during one season
Approximately, how many distinct synapses are established on the dendrites and cell body of a motor neuron in the spinal cord?
(a) tens (b) hundreds (c) thousands (d) millions