Stem cells are being used to treat many conditions, including spinal cord injuries and macular degeneration. However, using stem cells raises some ethical questions. Why are there ethical concerns with using stem cells? A. Harvesting embryonic stem cells often results in destruction of an embryo.
B. Adult stem cells are often harvested without consent from patients in hospitals.
C. Induced pluripotent stem cells are not as powerful totipotent stem cells.
D. Adult stem cells often cause premature aging when injected into younger patients.

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.

The leopard frog and the pickerel frog are two closely related species. in areas where their ranges overlap, the frogs will remain separate species if they

Which statement correctly identifies the scientific question and describes why the question is scientific? question 1 refers to the supernatural.question 2 reflects a moral or social value.question 3 refers to something that can be measured.question 4 reflects a question that can’t be observed.