Zooxanthellae are ________
A) symbiotic algae that provide corals with energy via their photosynthetic activity
B) an invasive species of kelp in the Indian Ocean
C) symbiotic bacteria that decompose tissues of dead animals in oceans
D) an endangered species of fish in the Pacific Ocean
E) symbiotic bacteria that fix nitrogen in oceans
Answer: A
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Which of the following is incorrect?
a. The hydrosphere includes water in solid, gas, and liquid forms. b. The lithosphere includes the mantle and crust. c. The biosphere is the only biotic sphere. d. Oxygen is the major element of the atmosphere. e All living organisms are part of the biosphere.
What is a desert pavement? How do desert pavements probably form? What evidence supports this interpretation?
What will be an ideal response?
Asteroids are more abundant than meteoroids
a. True b. False
Which of the following is NOT true of the freezing point of water?
A) There is a single freezing point, 0°C (32°F). B) Freezing point varies with volume and atmospheric conditions. C) Purity of water can influence freezing point. D) Freezing point ranges from 0°C to -40°C (32°F to -40°F).