Which plant cell organelle uses light energy to produce sugar?

Astudent observes a star from two positions of earth in its orbit, in summer and winter, and measures the change in the position of the star. which of these can be best calculated by this method?

Hey me with this one❤☺❤ how do you say that a cell also has a life span and death like an organism? give one example.

What is the following best defines climate?