Answer:
Either B. or D.
Explanation:
I don't know for sure, these two answers just seem better than the others.
inside the cell
b. chloroplast
Hope it helps ya
They are still living because algae is like plant
1st graph/diagram --> 2nd description (between top and bottom)
2nd graph/diagram --> 3rd description (bottom/last one)
3rd graph/diagram --> 1st description (top one)