Which of the following is an example of qualitative observation? a. joseph is observing the color difference in the reaction mixture of each of the test samples to see what types of proteins are present in them.
b. joseph is measuring the color of the reaction mixture colorimetrically to see the concentration of proteins in the sample.
c. joseph is observing the color of the reaction mixture to see whether proteins are present in the given solution.

Which of the following describes a negative feedback loop? when the heart rate is too high, the body sends hormones that continually increase the heart rate higher. when a pregnant woman is in labor, the body sends hormones that increase the intensity of contractions, which then increases the secretion of the same hormones. when blood sugar is too low, the body sends hormones that raise blood sugar until it reaches a typical level and hormone secretion slows. when a person is jogging, the body sends hormones that continually decrease the rate of oxygen supply to the legs.

Some tools have graduations to show multiple measurements. for example, a ruler may have graduations for both millimeters and centimeters. when measuring the length of an earthworm, which graduations would allow for the most accurate measurement? millimeters centimeters decimeters meters

To be or not to be that is da question