Angela set out to determine how many genes control the length of people's eyelashes. She compared the length of eyelashes from 100 different people.
To determine the length, she placed each eyelash next to an eyelash of
known length. She then estimated the difference in length.
What is a possible source of error in her experiment?
A. She should have considered the number of eyelashes on each
eyelid in her data collection.
B. She may have had a difficult time making accurate measurements
by estimation.
C. She did not collect data from enough people,
D. She did not include a control group.