What happens during photophosphorylation?
Energy from sunlight uses hydrogen ions to make ADP.
Energy from sunlight uses electrons to make ATP.
Light breaks down ATP, releasing phosphate groups.
Water molecules are created from oxygen and hydrogen.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.  

propane is burned to provide the heat in many cooking grills. the chemical reaction for this process is shown in the equation below.

c3h8 + 5o2 ? 3 co2 + 4h2o + energy

what are the products in this chemical reaction?

3co2 + 4h2o + energy