Gills help fish extract oxygen.

Meaning: Fish use their gills to take oxygen out of the water.

Choice of Words: Gills are special organs that fish use to breathe. Extract means to take something out of something else.

Alternative Expressions

Fish use their gills to breathe.

Meaning: This means that fish use their gills to take in oxygen from the water and release carbon dioxide.

Choice of Words: **Fish** are animals that live in water. **Use** means to employ something for a purpose. **Gills** are special organs that fish have on their bodies that help them breathe underwater. **Breathe** means to take in air and let it out.

Gills are like lungs for fish.

Meaning: This means that gills are similar to lungs in that they both help animals to breathe.

Choice of Words: **Gills** are special organs that fish have on their bodies that help them breathe underwater. **Like** means similar to. **Lungs** are organs in our bodies that help us breathe air.

Related Expressions