Which statement is true?
a. An ecosystem doesn’t disappear until the last species it contained goes extinct.
b. Loss of biodiversity only matters to the extent that it affects crops and livestock.
c. Extinction is a natural component of the evolution of life on Earth.
d. Human impact on biodiversity has been inconsequential at most.
c. Extinction is a natural component of the evolution of life on Earth.
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Which element is most likely to share electrons with other atoms in joint orbitals?
a. chlorine (7 valence electrons) b. calcium (2 valence electrons) c. argon (8 valence electrons) d. carbon (4 valence electrons) e. potassium (1 valence electron)
Which heart condition is the most dangerous?
a. Tachycardia b. Atherosclerosis c. Bradycardia d. Atrial fibrillation e. Ventricular fibrillation
The concept of an ecosystem differs from that
of a community in that, unlike the community, the ecosystem includes the a. producers. b. decomposers. c. physical environmental factors. d. animals as well as the plants. e. parasites.
A chemical compound that releases OH? into a solution is called a(n):
A) hydroxide ion. B) solvent. C) acid. D) salt. E) base.