Afriend says that the temperature increases as altitude increases because you're moving closer to the sun is this true explain

No this is false, because in earth when you go on top of a mountain, it is not like 200 degrees Fahrenheit the temperature is usually lower when you are on top of a mountain

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem