Which of the following refers to the massive and sudden loss of plants and animals relative to the number of new species being added?
A. Catastrophism
B. Great death
C. Mass extinction
D. Fossil depletion
E. All of the answers listed here
Answer: C
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Compared to solar generated electricity, hydroelectric systems
A) are advantageous because they produce significantly less greenhouse gas. B) are advantageous because they operate as well at night as during the day. C) do not last as long as most solar technologies. D) cannot produce as much electricity as solar technologies.
An atom's mass number is 13 and its atomic number is 6. How many neutrons are in its nucleus?
A) 13 B) 6 C) 19 D) 7
Schooling behavior is thought to offer fish several advantages. Which one of the following is NOT an advantage of schooling?
a) Being together reduces the probability of running into a predatory fish b) The school may appear as a larger, more dangerous organism to a predator c) Schooling allows fish to get more exercise as they adjust their position in the school d) The appearance of many fish may confuse an attacking predator e) The chances of being eaten are smaller for an individual when there are many other fish to choose from
How is an alluvial fan formed?
A. A landslide blocks the stream, causing sediment to accumulate upstream. B. A stream erodes down through older terraces and entrenched meanders. C. Sediment is deposited by debris flows and streams that decrease in velocity along the mountain front. D. A dam increases the speed of currents below the dam.