1
An animal with a backbone.
2
An animal without a backbone.
3
Cold-blooded vertebrates that live both in water and on land.
4
Warm-blooded, feathered vertebrates with beaks and wings.
5
Cold-blooded vertebrates with scaly skin.
6
Gilled, cold-blooded aquatic vertebrates.
7
Warm-blooded vertebrates with fur or hair.
8
Organs used to extract oxygen from water.
9
Relating to animals that lay eggs.
10
Organs for breathing air in many animals.
11
Protective plates on the skin of some animals.
12
Body hair that keeps animals warm.
13
A biological process of transformation, such as caterpillar to butterfly.
7
3
6
13
11
1
2
5
4
12
10
9