Yes the platypus
A seahorse.
The platypus because it's the only animal that lays eggs and the only one with a beaver tail and a duck bill that is a semi aquatic mammal.
Yes. Frogs lay their eggs in stagnant or still water. The eggs hatch into a little aquatic animal called a tadpole that slowly developes into an adult frog.
A Caiman is a semi-aquatic reptile that lay eggs.
The male of the frog called Darwin's frog (Rhinoderma darwinii) hatches the female's eggs in the vocal sac of its throat. He swallows them after guarding them from predators for about three weeks. The tadpoles are never aquatic swimmers as in other frogs, but live in the sac for three days - they feed off their egg yolks and secretions of the male frog. He regurgitates them just before their metamorphosis into frogs.
The answer to this is not based on where the animal lives but on the type of animal. Animals that lay eggs have fewer extraembryonic membranes than placental mammals...there are mammals in the ocean as well as on land.
The male does. The female lays the eggs in a "brood" pouch inside the male's tale and th male carries the eggs from 4-6 weeks
A Caiman (Scientific name Caimaninae) is a semi-aquatic reptile and lays eggs.
OK, not an aquatic animal, but...When damselfly's go under the water's surface to lay eggs, they trap an air bubble around them to breathe.
Carries eggs in crustaceans
Seahorses do
Apart from its looks, it is an aquatic mammal that lays eggs!