21, penguins ,

feet or hands have skin connecting the

toes

or

fingers.

which of these animals have webbed feet?

• ducks

• robins

• cats

• frogs

When material is _____ , it does not let water pass through.

penguins' feathers are ​ (a)   , which keeps the birds warm and dry

• waterproof
• fireproof
• windproof

To _____ something is to control the way it moves

What do you use to setter these items ?

• cockpit

• airplane

• rudder

• train

• tracks

• bicycle

• handlebars

• car

• steering wheel

• boat

Wedded feet help penguins ​ (a)   through the cold Antarctic water.

• steer
• fly
• swim

A _____ is a sharp , high sound made by blowing air

Which of these are resons to whistle?

• Ask a quistion

• Get someone 's attention

• Ask for silence

• Tell someone to stop

_____ is used to show that a situation will be different if something specific does not happen?