Doctors do not administer vaccinations to people who are too sick. Which best explains why?

The weakened or dead form of the pathogen may be attacked by ther person's immune system.
The weakened or dead form of the pathogen may have a fatal effect when it is combined with medication that the sick people are taking.
The digestive systems of sick people may be negatively affected by the weakened or dead pathogen.
The white blood cells of sick people may not be able to efficiently handle the weakened or dead form of the pathogen.

D, The white blood cells of sick people may not be able to efficiently handle the weakened or dead form of the pathogen.

Explanation:

Vaccinations are essentially just weak diseases we use to create antibodies so the body can protect itself from the full disease. If it sees it once, it can defend itself, is the theory. This is choice D.

trachea, alveoli, lung capillaries, arteries

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.