Composed of mostly proteins and lipids, the cell membrane serves as the attachment point for the intracellular cytoskeleton in all cells and the cell wall in plant cells. the cell membrane's semipermeable nature allows it to regulate what enters and exits the cell. given this description, to what organ can the cell membrane best be compared? a. liver b. skin c. heart d. lung

What did the first language sound like

Now it's your turn to investigate human impact around the world. grab your virtual lab coat and put on your environmental science hat. you will be taking a trip around the globe to explore three locations. at each location, you will investigate the cause and effect relationships of deforestation, desertification, and urbanization. you will also gather evidence of how these factors have impacted the environment over time

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.