Question

Choose the correct answers from the alternatives given.
Which of the following groups have highly efficient circulatory and respiratory systems, and a complex nervous system and sensory organs?

• A. Reptiles
• B. Mammals
• C. Birds
• D. All of these

Answer 1

The correct option is D All of these

The circulatory system in chordates has a characteristic pattern and a proper respiratory system, nervous system and a skeletal system that gives proper shape and support. The reptiles, mammals, and fishes belonging to Chordata have all of these.

So, the correct option is, 'all of these'.