Astar’s apparent magnitude is a measure of
a. how far away it is
b. its size
c. how bright it seems to us

Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's activities. Wikipedia

ExplanatiomvLX1LlaAa_E0_xIwP_sjVh1bBtwrg%3A1635236858705&ei=-rt3YYbHKs2N4-EPicqC-Ac&oq=photosynthesis&gs_lcp=Cgdnd3Mtd2l66gIQJzoECCMQJzoFCAAQkQI64QgAQQsQMQxwEQ0QM6BQgAEIAESgQIQRgAUMTcAVin5gFg4fMBaAFwAHgAgAGfAYgB3&sclient=gws-wiz#:~:text=Photosynthesis%20is%20a%20process%20used%20by%20plants%20and%20other%20organisms%20to%20convert%20light%20energy%20into%20chemical%20energy%20that%2C%20through%20cellular%20respiration%2C%20can%20later%20be%20released%20to%20fuel%20the%20organism%27s%20activities.%20Wikipedia