A confused frog deposits its sperm onto a toad's eggs as they are being laid. No offspring develop because the frog's sperm are unable to penetrate the toad's egg. This is an example of
A. gametic isolation.
B. behavioral isolation.
C. mechanical isolation.
D. habitat isolation.
E. temporal isolation.
Answer: A
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A. autotrophs B. facultative anaerobes C. obligate anaerobes D. aerobic E. phototrophs
Considering two species of birds, which of the
following is a derived character?
a. four limbs b. a bony skeleton c. egg production d. feathers e. two eyes
Ricin is
a. a substance found in castor bean seeds. b. a polysaccharide extracted from rice. c. an ingredient in many paints and cosmetics. d. a protein that inactivates ribosomes. e. a substance found in castor bean seeds and a protein that inactivates ribosomes.
Chondrichthyes includes
A) whales. B) all fishes. C) lampreys. D) frogs. E) sharks.