About 88 percent of geologic time is represented by the time span called the ________. Precambrian Mesozoic Paleozoic Phanerozoic
What will be an ideal response?
Precambrian
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What is the path of comets around the sun?
a. ?They range far beyond the planetary part of our solar system and loop past the sun and back into outer space. b. ?Their path is the same as Earth. c. ?They have a circular orbit around the sun. d. ?They orbit Earth, not the sun. e. ?They don’t orbit the sun; they are pulled to the sun by its gravity and eventually crash into it.?
Many species have provided medicines and products demonstrating that biodiversity has ________ value and should therefore be preserved
A) entertainment B) ethical C) economic D) religious E) aesthetic
How much energy is available to the third trophic level, a secondary consumer, if its prey in the second trophic level, a primary consumer, is only able to obtain 10% of the available energy of the first trophic level?
a. 100% b. 10% c. 1% d. 0.1%
Stream restoration techniques include all of the following except
A. Planting ground cover on uplands to reduce erosion B. Narrowing a stream to increase its speed C. Using small amounts of dynamite to unclog waterways D. Placing dams in streams to deflect current away from the banks E. Creating fish habitat