View the “universal communication molecule.” Based on its structure, what is true about it? a) It’s polar and hydrophilic c) It’s polar and hydrophobic b) It’s non-polar and hydrophilic d) It’s non-polar and hydrophobic

(drag each tile to the correct location.) categorize each term as something that is typical of a scientific theory, a scientific hypothesis, or both. - a tentative statement used to guide scientific investigations. - makes predictions about future events. - can be tested by many independent researchers. - based on observations of natural phenomena. - a well-established, highly reliable explanation.

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time

Long term exposure to waves can cause sunburns and skin cancer.