Vertebrates, Fishes, Amphibians, Reptiles and Birds
Science

An egg with a shell and membrane to protect the embryo, like an egg laid by birds, reptiles, and mammals
Amniotic egg
An egg with a shell and membrane to protect the embryo, like an egg laid by birds, reptiles, and mammals. Amniotic egg. An amniotic egg is a type of egg where the embryo develops inside a protective membrane and shell, allowing it to survive on land.

The shell of a turtle or tortoise, or the plate that covers the head of a crustacean
Carapace
The shell of a turtle or tortoise, or the plate that covers the head of a crustacean. Carapace. A carapace is a protective shell on the back of some animals, like turtles and crustaceans, which helps shield them from predators and environmental hazards.

The sensory receptors that fish use to detect movement and vibrations in the water
Lateral line system
The sensory receptors that fish use to detect movement and vibrations in the water lateral line system. The lateral line system is a network of canals and sensory cells in fish and some amphibians that helps them sense movements and vibrations in the surrounding water.

A gas-filled sac in bony fishes that helps them to control their swim depth
Swim bladder
A gas-filled sac in bony fishes that helps them to control their swim depth. Swim bladder. The swim bladder is an internal organ that acts like a floatation device, allowing fish to maintain or change their position in the water without effort.