Animals

Question 1

Where did the first animals evolve?

Answer 1

In the sea

Question 2

Where did animals later evolve?

Answer 2

They later evolved to live on fresh water and eventually they emerged to live on land.

Question 3

Give an idea of the range of animals.

Answer 3

Simple sponges and jellyfish, through flatworms, roundworms, and segmented worms, to snails, insects and animals with backbones (vertebrates) such as fish, birds and humans.

Question 4

Name the 7 main features of animals

Answer 4

1. They are multicellular organisms that take in food.
2. They do not have cell walls.
3. They have a nervous system.
4. They have a muscular system.
5. They normally reproduce sexually.
6. They have large eggs that cannot move by themselves (non-motile).
7. They have small sperm that can swim by using a tail or flagellum.