Which of the following is a synonym for the circulatory system? A Respiratory systemincorrect answer
B Endocrine systemincorrect answer
C Integumentary systemincorrect answer
D Cardiovascular system

Iron reacts with oxygen to produce iron oxide (rust). this reaction is represented in an equation as 4fe + xo2 → 2fe2o3. identify the value of x that will balance the equation.

As the human population grows, what happens to our natural-resource requirements? o they increase o they decrease o they do not change. they go in cycles

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.