C I guess?
I think it's wrong
This is a case of pulmonary embolism. In a patient treated for a broken leg, immobilization of the affected limb is strongly advised; although immobilization imposes a risk to develop deep vein thrombosis or the development of clot most commonly in the popliteal veins. This clot or thrombus can be dislodged and can travel to the right ventricle then pumped into the pulmonary circulation; causing dyspnea, chest pain, and hemoptysis.
B Since protons and electrons have to be the same amount!
“Spool-like” structures around which DNA is wrapped around 1.65 times