In Endler's (1980) studies, the evolution of male guppy coloration is affected by predation and sexual selection. What effect on brightness do the two forces have?
A. Predation: increases; Sexual selection: decreases
B. Predation: decreases; Sexual selection: increases
C. Predation: decreases; Sexual selection: decreases
D. Predation: increases; Sexual selection: increases
Answer: B. Predation: decreases; Sexual selection: increases
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How much energy is ultimately converted into chemical energy by photosynthesis?
a. less than 1% b. 1-2% c. 5% d. 10% e. 20%
Fossil evidence shows that Tiktaalik had both lungs and gills, indicating that it could
A. absorb oxygen only from the water.
B. take in food for nutrition from the air or the water.
C. absorb oxygen from both air and water.
D. absorb oxygen only from the air.
E. take in food for nutrition through the gills, but breath the air for oxygen.
Noncyclic electron transport needs a constant supply of electrons. These are obtained from:a
light. b. CO2. c. glucose. d. H2O. e. ATP.
Gene duplications provide an explanation for the origin of gene families
Indicate whether the statement is true or false