Which ones of the following animals are invertebrates?

The housefly, silverfish, trout, jellyfish, whale, penguin, lizard and sponge.

Give any one difference between each of the following: 

Protozoa and Metazoa 

Give any one difference between each of the following: 

Insecta and Arachnida 

Give any one difference between each of the following: 

Flatworm and Roundworm 

Choose the term or feature which does not match with the given animal. 

Amoeba -

Choose the term or feature which does not match with the given animal. 

Hydra -

Choose the term or feature which does not match with the given animal.

Fish 

Choose the term or feature which does not match with earthworm.

Choose the term or feature which does not match with the given animal.

Grasshopper -