In tenis does your knees have to be slightly flexed for both the forehand and backhand?

Which statement about covalent bonds is true

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

What conclusion can be made based on the temperature of soil when the light hits the soil at 0°, 45°, and 90° angles in section 2 of the experiment? did your results support your hypothesis? why or why not?