Plankton that measure between 0.2 to 2 microns are classified, based on size, as which of the following?
A) Macroplankton
B) Phytoplankton
C) Picoplankton
D) Virioplankton
E) Zooplankton
C
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In the 1970s the price of copper rose rapidly, but since then it has declined substantially. In what ways do these variations demonstrate the effect of substitutability on mineral resource use?
What will be an ideal response?
All of the following are physical limiting factors affecting survival and growth of an organism except ________
A) salinity B) temperature C) predation D) sunlight
Plate tectonics is a result of Earth's internal heat engine, powered by
A. gravity B. the Sun C. heat flowing from Earth's interior outward
The three intervals, from oldest to youngest, of Precambrian time are the ____
a. Hadean Eon, Archean Eon, and Proterozoic Eon b. Archean Era, Hadean Era, and Proterozoic Era c. Proterozoic Eon, Hadean Eon, and Archean Eon d. Hadean Era, Archean Era, and Proterozoic Era e. Archean Eon, Hadean Eon, and Proterozoic Eon