Gene therapy :
A) May be a future medical treatment for hereditary disease
B) Places a healthy copy of a gene into the cells of a person with defective gene
C) Requires that the information coded for by a gene can be read
D) All the above

You are travelling on a long non-stop flight from tahiti to tampa. you have been in the air for about 7 hours and have not moved, since you boarded the plane at tahiti. you need to use the rest room and on standing up feel dizzy. the best explanation for your dizziness