Answer:
AA, Aa,as thos are possibly the answer good luck! <3
Im not sure if this will be the answer you teacher is looking for but i think the answer would be
Hair on the head protects scalp from injury and sunlight
Eyelashes and eyebrows protect eyes
Nostril and ear hairs protect from foreign particles
The cell membrane, and probably the cytoplasme
The SEED of a flower develops into the fruit