Which of the following is/are a role of testosterone in males? i. pre-natal development of male genitalia ii. maintenance of sex drive iii. increase in mental development
a. ii only
b. i and ii only
c. ii and iii only
d. i, ii and iii

Types of scientific inquiry that biologist engage in that cannot be completely controlled

What controls activities within a eukaryotic cell?

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a. one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b. one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c. one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.