Which animals are often sessile or planktonic (drifting or weakly swimming)?

کون سے جانور اکثر سیسل یا پلانکٹونک ہوتے ہیں (بہتے یا کمزور تیراکی)؟

Radial

Bilateral

Both A and B

None of these

Radial animals are often sessile (attached to a surface) or planktonic (drifting or weak swimmers).

Their symmetry allows them to interact with the environment equally from all sides.