Which among the following living being has respiratory organ but does not have brain ? (a) crab (b)starfish (c)blood succor (d)silverfish
Option B) Starfish do not have many well-defined sensory inputs, they are sensitive to touch, light, temperature, orientation, and the status of water around them. The tube feet, spines, and pedicellariae found on starfish are sensitive to touch, while eyespots on the ends of the rays are light-sensitive. The tube feet, especially those at the tips of the rays, are also sensitive to chemicals and this sensitivity is used in locating odour sources such as food.
option b
