Which statement is one of the three parts of cell theory? a. the smallest living things are single cells, and cells are the functional units of multicellular organisms. b. there are three types of cells, prokaryotic, eukaryotic plant, and eukaryotic animal. c. cells make up tissues, tissues make up organs, organs make up systems, systems make up organisms. d. cell organelles can be membrane-bound or not membrane-bound.

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.

Which of these statements is false? a. others may notice a problem with a relationship before the people involved. b. the first sign of a problem with a relationship is a feeling of anger. c. damaged relationships can be repaired. d. even good relationships can be damaged.

How can we use spectral lines of light coming from the superclusters to identify which is receding from earth at the slowest rate.