The carbon cycle is closely linked to energy flow within an ecosystem because
a. carbon can be used as an energy source.
b. all organisms are made of carbon compounds.
c. carbon can form four covalent bonds.
d. energy and carbon are both fixed into nutrient molecules by producers.
e. carbon compounds can be both inorganic and organic.
D
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A pied kingfisher in its first year of life helps in the feeding of three full siblings who would not have survived without the helper's efforts. What is its indirect fitness in its first year?
A) 0.25 B) 0.50 C) 0.75 D) 1.00 E) 1.50
Cyclosporiosis is transmissable from person to person
Indicate whether this statement is TRUE or FALSE.
Rotifers obtain their food by the action of
a. tentacles. b. cilia on the wheel organ. c. a muscular pharynx. d. pseudopodia.
Rods differ from cones in that
A. cones are more sensitive. B. rods respond to a broad spectrum of light wavelengths. C. cones are widely dispersed in the retina. D. rods are concentrated in the fovea centralis.