place Exercise 3 Complete these sentences with prepositions from the box. on alter from out lack vemo men around in during through into live. e Though frogs spend most of their time 'on land, adult frogs ponds, lakes and puddles. Female frogs lay eggs in the water. a few days, the small black eggs begin to change shape. They become longer. this stage, they are called tadpoles. a few months, the legs of tadpoles begin to develop and they begin to look different. Tadpoles breathe their gills which are present both sides of their heads. end NG Later, the gills are replaced by lungs. this stage, they come of the water to breathe. The tail which grew the tadpole stage, is gradually absorbed the body An adult frog never goes very far" the water. Frogs always need to live damp conditions or they will die.
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In physiology, respiration is the movement of oxygen from the outside environment to the cells within tissues, and the removal of carbon dioxide in the opposite direction.
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