Answer:
B. Gametophytes of seedless vascular plants
Because u might have made a mistake on the first investigation so u want to repeat it a few more times
Differentiation is the way they adapt to their functions
You absorb vitamin d from sunlight shining on your skin.
Vitamin d can help the absorption of calcium, which is capable for strengthening your bones and teeth.
Therefore if u r lacking of vitamin d, your bones and teeth may be soft, and especially among children, you may get ricket, where the legs are bent outwards.
