(needed asap )

which of the following is the best example of potential energy?

a bowling ball rolling toward the pins

a horse running in an open field

a pitcher preparing to throw a ball

a runner sprinting to the finish line

The phlogiston theory in the 17th century attempted to explain burning. the theory stated that combustable objects contained a material called phlogiston, a substance without mass, color, odor, etc. after objects burned, the objects were dephlogistonated and were then in their true form. the phlogiston theory was accepted until the 18th century, when lavoisier proved that combustion requires a gas that has mass. phlogiston is considered a) to be scientific knowledge b) not to be scientific knowledge c) to be proven by scientific method d) to be accepted in the modern scientific community

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

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