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.

In natural selection, what is actually “selected? ” a) alleles are directly selected b) genotypes are directly selected c) phenotypes are directly selected d) entire populations are directly selected

Which organ controls breathing? lungs alveoli heart diaphragm

Even though the ostrich is a flightless bird, ostriches still possess wings that stretch approximately two meters across when fully extended. scientists speculate that when dinosaurs became extinct, some of the birds that lived during that time became land dwellers since they were able to consume the food that the dinosaurs once ate. over time, these species grew larger and heavier. eventually, the ostrich species became too big to fly. the wings found on ostriches are known as a. analogous structures. b. homologous structures. c. vestigial structures. d. symmetrical structures.