Here's a problem to solve: A student observes that a one-celled organism and a plant leaf have similar green parts. The student thinks that both organisms use the green parts to live. Which evidence supports the conclusion that both organisms need the green parts to live?

Among the 4 following options, which is the correct answer?

- A: Both organisms use the green parts to move.
 
- B: Both organisms die if the green parts are removed.
 
- C: The green parts in both organisms are observed making light.
 
- D: The green parts in both organisms can make more green parts.
 