The organelles that function as a cell's "garbage disposals," breaking down organic materials, are
A. Golgi apparatuses.
B. ribosomes.
C. lysosomes.
D. mitochondria.
Answer: C
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The primary cause of soil erosion is ________
A) no-till agriculture B) crop rotation C) strip cropping D) use of crop cover E) over cultivation
Deep lakes with steep banks that have a small amount of plant nutrients are ____.
A. oligotrophic lakes B. eutrophic lakes C. culturally eutrophic lakes D. hypereutrophic lakes E. mesotrophic lakes
The current practice of geothermal power generation may not always provide a practical renewable energy source because ________
A) geologically heated groundwater is unsuitable for these plants and must be purified first B) in some cases, the heated groundwater is used much faster than it is recharged C) in many cases, the magma is used faster than it is recharged D) power plants have high maintenance costs E) in some instances, pollution emissions can be very high
Volcanic domes grow from lava being injected into the interior of mounds of cooled lava and from the breaking out and moving down the flanks of
A) viscous lava flows. B) runny lava flows. C) basaltic lava flows.