What structures of the circulatory system carry blood containing carbon dioxide from the body back to the heart ?

Which organelles are involved in energy conversion

Which kingdom includes some organisms that have no nucleus and can live in an environment with an extremely high salt content

Anurse is preparing to administer ampicillin 500 mg in 50 ml of dextrose 5% in water (d5w) to infuse over 15 min. the drop factor of the manual iv tubing is 10 gtt/ml. the nurse should set the manual iv infusion to deliver how many gtt/min? (round the answer to the nearest whole number. use a leading zero if it applies. do not use a trailing zero.)