What is the difference between an invertebrate and a vertebrate?
.
What makes an animal?
.
What is a heart for? What does it do?
.
Is all blood the same color?
.
Do animals without hearts exist?
.
What is the difference between a prey and a predator?
.
What is a parasite?
.
Is it possible for another animal to eat a human?
.
What is the food chain? How does it work?
.
What is an amphibian?
.
What does a caterpillar grow into? Why does it change?
.
