Mark the following statement as true or false. Correct the false statement.

Frogs can breathe through their skin as well as lungs.

Mark the following statement as true or false. Correct the false statement.

Insects have spiracles on the lower surface of the body.

Mark the following statement as true or false. Correct the false statement.

Exhaled air has more percentage of ${\mathrm{CO}}_2$ than inhaled air.

Pick the odd-one-out from the group given below on the basis of respiratory organ. Give a reason for your answer.

Cockroach, grasshopper, snail, ant.

Pick the odd-one-out from the group given below on the basis of respiratory organ. Give a reason for your answer.

Lizard, cow, earthworm, snake.

Pick the odd-one-out from the group given below on the basis of respiratory organ. Give a reason for your answer.

Crocodile, whale, dolphin, fish.