It needs a C) host cell in order to reproduce
Answer:
i thinks its b.
Explanation:
hopes this helps!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
C is the crust biosphere
E is the mantle
B is the oceananic crust slash like plate like tectonics
Answer:
PVR is calculated by the formulae: 
Explanation:
Pulmonary vascular resistance may be defined as the resistance to blood through the pulmonary circulation.
PVR can be determined by the following formula:

Here, PAP is the pulmonary artery pressure, PAOP is pulmonary artery occlusion pressure and CO is cardiac output.
B). Valence Electrons only, as two or more chemials bond the Valence electrons jump from chemical to chemical or the share the electrons to form a bond