Which of these molluscs commonly have a coiled shell?
A) gastropods only
B) bivalves only
C) cephalopods only
D) gastropods and bivalves
Answer: A
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Nondegradable
What will be an ideal response?
How do scientists believe that an asteroid impact in the Yucatan peninsula of Central America caused a worldwide mass extinction?
A. by blocking the sun and inhibiting photosynthesis B. by using up all of the oxygen in the atmosphere C. most of the animals in the world were in the tropics of Central America D. by causing massive floods E. by heating up the planet
In the figure above, what absorbs photons of light only in the blue/violet range and not light in the red
portion of the spectrum?
a. 5 with 3 b. 5 with 4 c. 5, regardless of the R group d. 6 e. 7
Geosmins are
A. a strain of Bacillus. B. nitrogen-fixing bacteria. C. metabolites that give soil its odor. D. produced by Rhizobium. E. metabolites that give soil its odor AND produced by Rhizobium.