Which of the following best describes why someone with an immune deficiency disorders may get sick more easily than someone without the disorder?

a) part of the immune system does not function properly

b) masses of cells form and steal nutrients from healthy cells

c) healthy cells are mistaken for pathogens and get attack

What evidence for the age of the earth is indicated by the fact that sedimentary rock is found on mountain tops? that the earth has expanded outward from water beds that mountains formed first before anything else that some force lifted the rocks from the water the earth is not very old and has not had time for many rock layers to form