In marine sticklebacks, the Pitx1 gene is ____, but in freshwater sticklebacks, the Pitx1 gene is ____
a. not expressed and spines are present; expressed and spines are absent
b. not expressed and spines are absent; expressed and spines are present
c. expressed and spines are present; not expressed and spines are absent
d. expressed and spines are absent; not expressed and spines are present
e. present so spines develop; absent so spines do not develop
ANSWER: c
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