All stem cells ____
a. are differentiated cells that proliferate indefinitely
b. can differentiate into any cell type, but can only divide once after terminally differentiating
c. have the ability to differentiate into all cell types
d. are undifferentiated cells that proliferate indefinitely
e. are undifferentiated cells that proliferate a finite number of times
ANSWER: d
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Summarize the experiment by Darwin that provided the first evidence for auxins
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