Doctors do not administer vaccinations to people who are too sick. which best explains why?
a. the weakened or dead form of the pathogen may not have any effect on sick people.
b. 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.
c. the digestive systems of sick people may be negatively affected by the weakened or dead pathogen.
d. the white blood cells of sick people may not be able to efficiently handle the weakened or dead form of the pathogen.

What is thought to have caused the mass extinction at the end of the cretaceous period?

Which of the following is a difference between active transport and facilitated diffusion? view available hint(s)which of the following is a difference between active transport and facilitated diffusion? facilitated diffusion can move solutes against a concentration gradient, and active transport cannot.active transport involves transport proteins, and facilitated diffusion does not.facilitated diffusion involves transport proteins, and active transport does not.active transport requires the expenditure of cellular energy, and facilitated diffusion does not.

Which represents the cross between parent plants if one is heterozygous for yellow-colored pods and the other is homozygous for green-colored pods? yy  ´    ´    ´    ´  yy