What is the main body structure of seaweed?
a. stem
b. stilt root
c. prop root
d. thallus
e. trunk
d
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A constitutional democracy would have the most difficulty in responding to
A. a threat of attack B. the possibility of long-range global warming C. an economic depression D. a labor strike E. a sharp increase in gasoline prices
As the temperature of a parcel of air increases, its ability to hold water vapor ____
a. increases b. decreases c. remains constant d. increases then decreases
How to estimate Earth's age as 4.5 to 4.6 billion years
What will be an ideal response?
What is the ultimate source for geothermal energy?
A. ignition due to crude oil and natural gas deposits B. magma that wells up from Earth's core C. the radioactive decay of elements deep within Earth D. rocks melting into magma due to geysers