Given below are two statements, one is labelled as Assertion (A) and the other as Reason (R). Assertion (A): Amphibians can tolerate mixing of oxygenated and deoxygenated blood. Reason (R): Amphibians are animals with two chambered heart.

Which one of the following animals has a three-chambered heart?

With reference to 'earthworms', which of the following statements is/are correct? 1. Earthworms improves soil fertility and are known as farmer's friends. 2. Earthworm has two pair of hearts.

Which of the following classes of animals has/have three-chambered heart?

Which of the following statements is/are correct? 1. Dolphins and Whales breathe through blowholes. 2. Earthworm breathe through their skin.

The animal without red blood cells is