An anion is formed when
A) an atom gains one or more negatively-charged electrons.
B) an atom loses one or more positively-charged protons.
C) an atom loses one or more negatively-charged electrons.
D) an atom gains one or more positively-charged protons.
E) an atom has an equal number of positively-charged protons and negatively-charged electrons.
Answer: A
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When the body experiences stress, the sympathetic division of the autonomic nervous system
stimulates the adrenal medulla to release
a. epinephrine. b. norepinephrine. c. knockout hormones. d. epinephrine and norepinephrine. e. epinephrine, norepinephrine, and knockout hormones.
On an annual basis, the greatest flow of carbon between nonbiological reservoirs takes place between:
a. the atmosphere and Earth's rocks b. the ocean and Earth's rocks c. the ocean and the atmosphere d. plants and Earth's rocks e. aquatic organisms and the atmosphere
Compare and contrast the homology that occurs in the forelimbs of mammals. What will be an ideal response?
The high body temperature of birds and mammals is due to
A) the fur that insulates them. B) their high metabolic rates. C) the presence of sweat, scent, and sebaceous glands. D) behaviors such as basking in the sun and seeking shade. E) the exchange of gases and nutrients via the placenta.