In a controlled experiment, if a researcher wants to examine the effect of radon exposure to rat longevity, which one would be the independent variable?
a) the rats' longevity.
b) the cage the rats were kept in.
c) radon exposure.
d) neither the radon exposure nor the rats' longevity, because both variables are manipulated.

From the list below, choose all the correct statements about the functions of fat. select all that apply. select all that apply. fat provides flavor and texture to food (think ice cream) and also leaves you satisfied for longer after a meal. fat in the diet allows for the transport of vitamins a, c, and e because they are fat-soluble. lipids are an essential component of cell membranes, act as insulation under the skin, and protect organs from injury. the body can rely on carbohydrate stores during periods of low energy intake. fat is a good source of energy providing 4 kcal/g.