In which of the following can a change be directly observed?

What is being converted during photosynthesis

(! ) what’s fracking and what does it have to do with carbon, carbon dioxide, or fossil fuels?

Ricardo notices that when he plays soccer in the rain, his ball does not seem to go as far after a kick. what is the best scientific question that ricardo could ask about this observation? is soccer better played in the rain or sun? how does rain affect the distance a soccer ball can travel? how does rain affect the speed of a soccer ball? is soccer affected by the rain?