Why was the feeding strategy of Riftia worms such a mystery to scientists when they were first
discovered?
a. These worms have no mouth.
b. These worms have no digestive tract.
c. These worms have no anus.
d. All of these choices
ANS: D
The Riftia worms contain large feeding bodies with tightly packed bacteria. The worms absorb
hydrogen sulfide and transport it to the bacteria. Information can be found in the section Examples of
Marine Communities
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Examine the satellite image of Death Valley, California
A) What province of the United States is it located within? B) Identify the various desert landforms seen there; circle and label them. C) Describe how each one forms. D) Finally, describe the sequence of events that produced this scene over time.
The single most effective agent of chemical weathering at Earth's surface is
A. water H2O B. carbonic acid H2CO3 C. hydrochloric acid HCl D. carbon dioxide CO2
Which of the following has NOT been cited as a possible cause of ice sheet darkening?
A) Ice melt has exposed darker land surface, water, and vegetation. B) Snow metamorphism C) Black carbon accumulation from wildfires D) Sunspot activity
A ________ flood occurs when heavy rain strikes a mountainous area
A) quick B) monsoon C) flash D) regional