Abby set out to determine how many genes control the length of people's pointer finger. She compared
the length of the forefinger from 12 different
people. She measured each person's finger by
placing a metric ruler next to the person's finger and
measuring the length.
What is a possible source of error in her
experiment?
O A. She did not include a control group.
O B. She may have had a difficult time making
accurate measurements directly.
O C. She did not collect data from enough
people.
O D. She may have had a difficult time making
accurate measurements by estimation.

The table presents the average day and night temperatures in five cities. it also reveals whether a city receives substantial rainfall (wet climate) or little rainfall (dry climate). which city’s rocks are likeliest to experience frost wedging, and why? a) city a because the consistently subzero temperature would prevent water from melting b) city b because it is a wet region and the temperature fluctuates around the freezing point c) city c because it receives plenty of rain fall and the weather is moderately cool d) city d because the hot and dry weather would cause rocks to absorb water