Which feature is used to remove excess salt in marine animals?

• A. Swim Bladder
• B. Salt Glands
• C. Schooling
• D. Suspension Feeder

Answer: (B)

Marine animals must manage excess salt because seawater is full of ions that can disrupt internal balance. Salt glands are specialized exocrine organs that actively remove this excess salt by transporting Na+ and Cl- from the blood and secreting a highly saline fluid, which is expelled from the body (often through the eyes or nostrils in seabirds and some reptiles). This lets the animal drink seawater and still keep its internal salt levels in check. The other options don’t address salt removal: a swim bladder is for buoyancy, schooling is a social/behavioral trait, and a suspension feeder refers to how an organism feeds rather than how it regulates ions.