Species that provide early warnings of damage to a community or an ecosystem are called ____ species.
A. foundation
B. indicator
C. keystone
D. endemic
E. endangered
Answer: B
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Which explanation best describes why Earth observers always see the same face of the moon?
A. The Moon's rate of spin matches the rate at which the Moon revolves around Earth. B. Earth and Moon are partially gravity locked. C. We tend only to observe the Moon at night, not during the day, when the opposite face is facing toward Earth. D. The Moon does not rotate as it circles Earth.
The gradient of streams tends to be ____________________ in their upper reaches and
____________________ in their lower reaches. Fill in the blank(s) with the appropriate word(s).
Greenwich mean time (GMT) is a system of
A. determining when daylight savings time should go into effect. B. coordinating the rules for what time should appear on a clock, around the world. C. determining what years should be considered leap years and which should not. D. identifying the phase of the lunar cycle.
Which of the following is not part of the U.N.'s Millennium Development Goals to reduce poverty?
A) eradicate hunger B) provide universal college education C) promote gender equality D) combat HIV/AIDS E) improve maternal health