Neither.
A penguin is a flightless bird and a shark is a (cartilagenous) fish.
Sharks are not amphibians.
Penguins are not amphibians; nor have they ever been amphibians. Penguins are birds which happen to feed underwater.
Sharks are neither amphibians, mammals or reptiles. Sharks are fish.
yes
sharks
because the penguins dont get eaten by sharks they eat sharks
Penguins are birds; they lay eggs.
Because the group of animals called amphibians do some things that penguins can't. Amphibians can breathe through the skin, which penguins can't. Penguins can - and need to - maintain body heat, while amphibians will happily take on the ambient temperature.
Neither. Turtles are (aquatic) reptiles and penguins are (aquatic) flightless birds.
Salmon ,penguins, seals and other sharks
Sharks.
No, they are not. They are fish and related to sharks