Concept:Structures with similar names or appearances do not necessarily perform the same physiological role.
It is their function in the organism that determines whether they are comparable.
Explanation:Lungs and spiracles are both used for gaseous exchange, so they perform similar functions.
Feathers and scales are both protective skin outgrowths, so they also perform similar functions.
Contractile vacuoles and kidneys both carry out excretion and osmoregulation, hence having similar roles.
Root hairs are plant epidermal extensions that absorb water and mineral salts from the soil.
Mammalian hairs are animal structures that mainly provide insulation, protection, and sensation.
Therefore, root hairs and mammalian hairs have no similar functions to each other.
Answer:B. Root hairs and mammalian hairs