Question

1. which of the following is a characteristic of all reptiles?

• are fully aquatic
• use gills to breathe
• are ectothermic
• lack vertebrae

Explanation:

• Fully aquatic: False, most reptiles (e.g., lizards, snakes) are terrestrial.
• Use gills: False, reptiles use lungs to breathe.
• Ectothermic: True, all reptiles rely on external heat sources to regulate body temperature.
• Lack vertebrae: False, reptiles are vertebrates with a backbone.

Answer:

are ectothermic