Which of the following causes important changes to begin to occur in the circulatory system? A. Introduction of iron into the blood B. Introduction of air into the lungs C. Introduction of carbon dioxide into the lungs D. Introduction of calcium into the blood

Once an action plan is in place, it should not be changed.w select the best answer from the choices provided.truefalse

Explain what is meant by the phrase “ethical behavior”.

Will treating a viral infection with antibiotics affect the course of the infection? a) no; antibiotics work by inhibiting enzymes specific to bacteria. antibiotics have no effect on eukaryotic or virally encoded enzymes.b) no; antibiotics do not kill viruses because viruses do not have dna or rna.c) yes; antibiotics activate the immune system, and this decreases the severity of the infection. d) yes; antibiotics can prevent viral entry into the cell by binding to host-receptor proteins.