1. ALL FORMS OF LIFE

2. BACKBONE
A backbone is the main bone, made up of many small bones joined together, that, runs along the middle of the back in some animals.

3. Out of all the animals, very few have backbones.
97 out of every 100 do not have a backbone.
No Backbones
Animals without a backbone, or an internal skeleton, are called invertebrates
Have Backbones
Only 3 out of every 100 have a backbone.

4. Let’s look at a few of the thousands of animals without backbones.

6. Insects make up the largest group of animals without backbones, or invertebrates

7. three body parts - a head, thorax, and abdomen
All insects have:
three body parts - a head, thorax, and abdomen
The head is used mainly for eating, sensing things, and gathering information .
The thorax protects the body and gives support for the three pairs of jointed legs
The abdomen contains the organs used for digestion and reproduction.

8. All insects have:
six jointed legs
ant

9. All insects have:
grasshopper
an exoskeleton (outside skeleton)

10. All insects have: two antennae to sense the world around them
American cockroach
All insects have two antennae that they use to sense the world around them. Insects use them to feel, smell, and even taste!

11. MORE INVERTEBRATES
SEA STAR
OCTOPUS
CRAY FISH
JELLY FISH

12. TARANTULA
MILLIPEDE
SNAIL
EARTHWORM
MYRIAPODA

13. INVERTEBRATES GROUPS