Animals are eukaryotic and usually multicellular.
All animals can be divided into two groups-vertebrates and invertebrates.
- Vertebrates are animals that have a skeleton inside their bodies.
- Five group of vertebrates are
- Amphibians, reptiles, fish, mammals and birds.
- Amphibians, reptiles and fish are cold blooded.
- Mammals and birds are warm blooded.
- Invertebrates don’t have backbone.
- Insects and some other invertebrates have exoskeleton.
- An exoskeleton is a hard outer covering that protects an animal’s body and gives it support.
- There are six groups of invertebrates.
- 1 Sponges. 2. corals, hydras, jellyfish. 3. worms, 4. Starfish and sea urchins, 5. Mollusks, 6. Arthropods.
- Sponges, hydra, corals look like plants but they are animals.
- A tapeworm is a flatworm that can live inside the body of animals and humans.
- A snail is mollusks with a single hard shell.