If an immune system lost the ability to make helper T cells, the B cells could still be activated by ___

If you are in a chronic state of anxiety but also suffer from moment of sudden, intense fear you are problably suffering. from

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 is the correct answer for the process of water eroding soil? rills, sheet erosion, gullies sheet erosion, rill, gullies gullies, rills, sheet erosion sheet erosion, gullies, rills