What is the average mass of one atom of silicon?

Abanana plant produces rhizomes, which are involved in

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

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?