1. 7De
No backbone!
1 Copy the table and write the names of these invertebrates in the correct column.
brittle star
butterfly
sea urchin
weevil
Arthropods
Echinoderms
Molluscs
scorpion
fly
starfish
snail
slug
crab

2. 7De
No backbone!
2 Look at these animals. For each one write down which group you think it belongs to and why.
leech
lobster

3. 7De
No backbone!
3 For each of these lists of organisms, write down which is the odd one out and why.
a) snail, reindeer, pig, oak tree, sponge
b) tapeworm, slug, wasp, eagle, starfish
c) sea urchin, fly, spider, ant, lobster
d) dolphin, salmon, seagull, lobster, crocodile
e) bear, horse, pig, hamster, frog

4. 7De
No backbone!
1 Copy the table and write the names of these invertebrates in the correct column:
weevil, sea urchin, slug, butterfly, scorpion, crap, brittle star, fly, snail, starfish.
Arthropods
Echinoderms
Molluscs
butterfly
brittle star
slug
crab
sea urchin
snail
scorpion
starfish
weevil
fly

5. 7De
No backbone!
2 Look at these animals. For each one write down which group you think it belongs to and why.
Lobster is an arthropod: jointed legs, hard outer body covering.
Leech is an annelid: round worm-like body in sections.
leech
lobster

6. 7De
No backbone!
3 For each of these lists of organisms, write down which is the odd one out and why.
a) snail, reindeer, pig, oak tree, sponge
oak tree: the others are animals
b) tapeworm, slug, wasp, eagle, starfish
eagle: the others are invertebrates
c) sea urchin, fly, spider, ant, lobster
sea urchin: the others are arthropods

7. 7De
No backbone!
3 For each of these lists of organisms, write down which is the odd one out and why.
d) dolphin, salmon, seagull, lobster, crocodile
lobster: the others are vertebrates
e) bear, horse, pig, hamster, frog
frog: the others are mammals