0
Monotremes lay eggs, as do reptiles.
Monotremes' limbs go outward (rather than downward) from their main body, which is also true for reptiles.
Monotremes lack a corpus callosum (which placental mammals have), as do reptiles.
Monotremes and reptiles both have cloacas, while placental mammals have separate openings for urination and defecation.
This evidence all shows monotremes to be a link between reptiles and mammals, but we now think that monotremes just evolved from an earlier branching from the mammalian tree of lineage than the marsupials and placental mammals evolved from. Monotremes are not a link between reptiles and mammals.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
Do mosquitoes give birth or lay eggs?
Mosquitos lay eggs. They are not classified as mammals, they are classified as insects.
Do penguins lay eggs and are they mammals?
Penguins lay eggs, but they are not mammals. They are birds. The only two egg-laying mammals in existence are the platypusand the echidna, which are classed as monotremes.They are still classified as mammals because they feed their young on mothers' milk - a characteristic unique to mammals alone.
Do white rhinos lay eggs?
No. Rabbits do not lay eggs. They are placental mammals. The only mammals which lay eggs are the monotremes, which include the platypus and the echidna.
What are the only two marsupials that lay eggs?
Marsupials do not lay eggs. Only monotremes lay eggs.The platypus and the echidna are both egg-laying mammals, or monotremes. They are still classified as mammals because they feed their young on mothers' milk - a characteristic unique to mammals alone.
How many eggs does a jaguar lay?
Jaguars are mammals. Mammals do not lay eggs.
Are birds the only mammals that lay eggs?
Birds are not mammals. They are in their own category, which is "Birds". The only two egg-laying mammals are the platypus and the echidna, which are classified as monotremes.
Do gorillas lay eggs?
No, they're mammals. Mammals don't lay eggs (except for monotremes).
Does the elephant live young or lay eggs?
Elephants are mammals Mammals don't lay eggs
Do cougars lay eggs or have birth?
Cougars are mammals. Mammals do not lay eggs. They have a live birth.
Where do porcupines lay eggs?
Porcupines are mammals and do not lay eggs
Where do elaphants lay their eggs?
Elephants are mammals, and do not lay eggs.
What mammals don't lay eggs with shells?
There are two egg-laying mammals, and they both lay eggs with shells, but the shells are leathery, rather than hard shells, like birds' eggs. The platypus and the echidna are both egg-laying mammals, or monotremes. They are still classified as mammals because they feed their young on mothers' milk - a characteristic unique to mammals alone.
