This substance makes up the majority of your cells, and is necessary for them to carry out most of their chemical reactions. what is it?
a) carbon
b) oxygen
c) sugar
d) water

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.

Donde se encuentra el adn nuclear en un organismo eucariota?

How does secondary succession differ from primary succession?