Answer:
D i think. Not sure.
Explanation:
I mean i just did it myself, and i dont really do chemistry, but I would say D sorrry if i made you get it wrong!!
answer is B. And chloroplast is only found is plant cells.
Answer:
Relative motion of source and observer.
Explanation:
Doppler Effect : It is the change in the observed frequency of the wave due to<em><u> relative motion of the source and object </u></em>.