Water Balance in Aquatic Life

Why is water essential for all living things on Earth?

• It helps them move around.

• It provides energy for their bodies.

• It allows chemical reactions necessary for life to happen.

• It keeps them warm in cold environments.

How do freshwater fish maintain the correct salt balance in their bodies?

• They actively drink a lot of water to dilute the salt.

• They absorb water through their gills because their bodies are saltier than the surrounding water.

• They have special organs that remove excess water from their bodies.

• They eat salty food to increase their internal salt concentration.

What is a major challenge for saltwater fish regarding water balance?

• They constantly absorb too much water from the ocean.

• They struggle to find enough salt in their diet.

• The salty ocean water constantly draws water out of their bodies.

• Their gills cannot process the high salt content in the water.

What is the primary role of chloride cells in fish gills?

• To help fish breathe by absorbing oxygen.

• To produce enzymes that break down food.

• To control the movement of salts like sodium and potassium across cell membranes.

• To store excess water for later use.