Scientist have discovered many fossils of dinosaurs. However, they have not discovered any dinosaur's fossils in rock layers that are younger than
65 million years old. What conclusion can be drawn from this evidence?

About __ of the mass of the cell is water

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.)

Which substance contains thylakoids? a) nadph b)atp c)stroma d)chloroplast