FISH
AMPHIBIANS
REPTILES
BIRDS
MAMMALS
100

These organs allow fish to extract dissolved oxygen from water

What are gills?

100

The biological process of transformation from a larva (tadpole) into an adult.

What is metamorphosis?

100

Reptiles are "ectothermic." This means they cannot do this.

What does it mean to regulate your own body temperature (or produce internal heat)?

100

It is covered in feathers.

What covers the bodies of birds?

100

Because it nourish their young with milk.

Why is an animal sorted (classified) as mammal?

200

This flexible gas-filled organ helps bony fish control their buoyancy without wasting energy.

What is the swim bladder?

200

The type of gas exchange (breathing) the amphibians do, besides using their small lungs.

What is the cutaneous respiration?

200

A type of reproduction of some reptiles, like vipers, that keep the eggs inside their body until they hatch, so the young are born "live". 

What is ovoviviparous?

200

Yes, they can because they are homeotherms.

Can birds regulate their temperature?

200

A small group of mammals that lay eggs.

What are monotremes?

300

This sensory system consists of a line of pores that detects vibrations and pressure changes in the water.

What is the lateral line?

300

This is the name of the group of amphibians that keep their tail as adults, such as newts and salamanders.

What are Urodeles?

300

Unlike amphibians, reptile skin is covered with these structures made of keratin.

What are scales?

300

Because they reduce their weight for flight.

Why birds have hollow bones?

300

Mammals give birth to underdeveloped young that must finish growing inside a pouch.

What are marsupials?

400

Fish whose skeleton is not made of bone, such as sharks and rays.

What are cartilaginous fish?

400

A layer that amphibian eggs lack, forcing them to lay them in water

What is a shell?

400

The order of reptiles characterised by having a hard shell protecting their body.

What are Chelonians?

400

It has different shapes according to the feeding.

What is the shape of the beak related to?

400

Fur.

What covers the bodies of mammals?

500

This bony flap covers and protects the gills in bony fish, and it opens and closes to help pump water over them.

What is the operculum?

500

Adult amphibians have a circulatory system with a heart that has this structure.

What group has three heart chambers (two atria and one ventricle)?

500

Most reptiles have this type of fertilization, which takes place inside the female's body and is an advantage for living on dry land.

What is internal fertilization?

500

They sit on them.

What do they do to keep their eggs warm?They sit on them.

500

The placenta.

What organ connects the calf with the mother?