If an atom has 15 electrons, how many protons does the atom have? A:16
B:15
C:14
D:this cannot be determined without looking at a periodic table first

Ineed ! i have no clue how to do this problem.

The reactions of photosynthesis occur in the of plant cell? a.mitochondria. b. lysosomes. c. chloroplasts. d. chlorophyll

Astudent conducts an experiment to determine how the amount of water given to a plant affects its growth. what is the independent variable for this experiment?