During childbirth, physical stretching of the uterus causes the release of a hormone that results in stronger, more frequent contractions. these contraction increase the stretching of the uterus. this is an example of a) a positive feedback loop, because the hormone increases uterine stretching. b) a negative feedback loop, because the hormone increases uterine stretching. c) a positive feedback loop, because a condition in the body causes an increase in a hormone. d) a negative feedback loop, because a condition in the body causes an increase in a hormone.

Differentiation of cells changes the nucleic information. true false

Radiometric dating is used to tell the absolute age of materials by studying the decay rate of radioactive isotopes. the decay rates of isotopes are constant and are expressed as .

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.