Organisms that float, but cannot swim against the tides and waves, are known as ________.
A. aphoton
B. benthos
C. nekton
D. plankton
E. photon
Answer: D
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After World War II, the peripheral states were commonly known as the Second World
Indicate whether this statement is true or false.
A savanna differs from a steppe in that the grasses are
A) intolerant to freezes in a savanna. B) only in riparian zones in a savanna. C) taller in a savanna. D) in drier areas in a savanna.
Which of the following is not true of the vernal equinox?
A) It occurs in March in the Northern Hemisphere B) It occurs in September in the Southern Hemisphere C) All locations on Earth experience 12 hours of daylight D) Locations above the Arctic Circle experience 24 hours of daylight E) Both Tropics experience the same intensity of the Sun's rays
The half-life of a radioactive element is the amount of time it takes for ____________________ of the atoms of the unstable ____________________ element to decay to atoms of a new, more stable ____________________ element.
Fill in the blank(s) with the appropriate word(s).