Select all the correct answers. THERE IS MORE THEN ONE ANSWER Review the graph. What can you conclude about the rate of photosynthesis and respiration in a plant?

Plants can’t photosynthesize at night.
Photosynthesis peaks at sunrise.
Plants need ATP production for the entire day.
Photosynthesis begins as soon as respiration starts.

Explain why electric current cannot exist if a current doesn't have a voltage source.

Acalorimeter uses the principle that thermal energy flows from hotter material to colder material until both reach the same

During a medieval siege of a castle, the attacking army uses a trebuchet to hurl heavy stones at the castle walls. if the trebuchet launches the stones with a velocity of at an angle of 50.0°, (a) how long does it take the stone to hit the ground? (b) what is the maximum distance that the trebuchet can be from the castle wall to be in range? (c) how high will the stones go? show all your work.