Unit1-3

Choose the animal that has an exoskeleton.

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What is the function of a platelets?

• It helps repair wounds.

• It helps in the clotting of blood.

• It protects the body against diseases.

• It carries oxygen to all parts of the body.

Fish and most young amphibians have _____________ to obtain oxygen from the water.

________________, birds, mammals and most adult amphibians have lungs for breathing.

Draw three different kinds of vertebrates.

Match following words to the best description below.

1. muscles

• These make up the skeleton, which helps the body stand upright.

• these always work in pairs where one contracts and one relaxes.

• these are areas of the skeleton that allow it to move.

• these protect the heart and lungs.

Write numbers in the boxes to put these sentences about the circulation of blood in the right order, starting with blood leaving the heart.

Fill in the first blank.

Fill in the second blank.

Fill in the last blank.