Agroup of science students have been learning how the human circulatory system reacts during exercise. the students measured their heart rates both before and after they ran five laps around the school gym. this was repeated two more times, with a 5-minute rest period between each trial. the average heart rates of the students are shown in the bar graph. state the general relationship between exercise and the heart rate in humans?

Dna has unique properties that allow it to accurately retain genetic information, even after multiple rounds of replication. one aspect of dna that allows it to accurately store genetic information is the base pairing from chargaff\'s first rule of the four nucleotide bases. if the c content of a dna molecule is 22%, what are the percentages of the remaining bases?

Consider this plant cell which organelle is labeled g

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.