Respuesta :
Answer:
flagella are long thin appendages free at one end attached to the cell.
pili are short thick straight hair
Answer:
i) Flagella are the thin appendages, threads of proteins.
ii) They involve in motility.
iii) Its number and arrangement vary.
Pilli:
i) They are hair like structures.
ii) No involvement in motility.
iii) It attaches to surfaces of bacteria.