1. Complete the sentence: 1. The lungs have a .... structure. 2. The Reptiles class got its name because

1. The lungs have a complex structure. The lungs are made up of millions of tiny air sacs called alveoli, which are surrounded by blood vessels. This structure allows for the exchange of oxygen and carbon dioxide between the air and the bloodstream.

2. The Reptiles class got its name because reptiles are animals that crawl or creep on their bellies (Latin: reptare - "to crawl"). This distinguishes them from other classes of animals such as mammals, birds, and fish, which have different modes of locomotion.

3. A crocodile"s heart is four-chambered. Similar to birds and mammals, crocodiles have a complete separation of oxygenated and deoxygenated blood, which allows for efficient circulation.

2. Choose one correct answer by highlighting it:
1. Lizards breathe through 1) trachea 2) lungs 3) skin 4) lungs and skin.
Answer: Lizards breathe through their lungs (option 2).

2. Reptiles have a 1) one-chambered heart 2) three-chambered heart 3) two-chambered heart 4) three-chambered heart with an incomplete septum in the ventricle.
Answer: Reptiles have a three-chambered heart (option 2).

3. The body of a lizard consists of 1) head, chest, torso 2) head, torso, 2 pairs of limbs, and tail 3) head, torso, tail 4) head, neck, torso.
Answer: The body of a lizard consists of the head, torso, 2 pairs of limbs, and tail (option 2).

4. The common earthworm...
I apologize, but the information about the common earthworm is missing in your question. Could you please provide more details or specify what aspect of the common earthworm you would like to know?

If you have any further questions, please let me know!