Question

multiple choice question
monotremes, which lay eggs, and marsupials and placentals, which are live - bearing, are three types of vertebrates called
o avian reptiles.
o amphibians.
o mammals.
o nonavian reptiles.

Explanation:

Monotremes (e.g., platypus), marsupials (e.g., kangaroo), and placentals (most common mammals like humans, dogs) are all types of mammals. Avian reptiles are birds. Amphibians (e.g., frogs) have a different life - cycle (aquatic larval stage). Non - avian reptiles (e.g., lizards, snakes) have different reproductive and other biological characteristics compared to the three groups mentioned.

Answer:

mammals.