Make up sentences from the words in brackets.
People get oxygen from the air, using their lungs. (Some of the oxygen you breathe / change / into a gas called carbon dioxide)
The fossil is the print of the living thing found in rock, or in ice or mud. (In 1861 / the fossil of a winged animal / discovered / scientists)
No one's sure how blue whales navigate. (Recently /a new theory about how blue whales navigate/formulate/some scientists)
Unlike humans, whales breathe voluntarily. (A whale's "nostrils" /call/ blowholes).