True. Food provides nutrients and energy which keeps us healthy.
1. True- because scientific theory means that <span>idea supported through research that attempts to explain existing observations or predict new ones.</span>2. False- because a cross-sectional means that its a study that is about different groups.
3. B-<span>An extraneous variable clarifies the relationship between the independent and dependent variables.</span>
True. hope this is right:)
3628.74 liters of helium balloon
will keep the 20 pounds of water and also give you a mass of 12 pounds.