All except Spider have hard protective shells.

In this question, we are given five options: Snail, Oyster, Lizard, Spider, and Earthworm. We need to identify the option that does not belong to the same group as the other four.

To solve this question, we need to analyze the characteristics or properties of each option and find a common factor that connects four of them, while one option stands out as different.

Analysis:
a) Snail: Snails are slow-moving creatures that have a soft body and a hard shell. They belong to the mollusk family.

b) Oyster: Oysters are also mollusks and have a hard shell. They are bivalve mollusks and are commonly found in oceans and seas.

c) Lizard: Lizards are reptiles that have scaly skin, four legs, and a tail. They are known for their ability to camouflage and their ability to regenerate their tails.

d) Spider: Spiders are arachnids and have eight legs. They are known for their ability to spin webs and their venomous bite.

e) Earthworm: Earthworms are annelids and belong to the phylum Annelida. They are known for their role in soil health as they help in decomposing organic matter.

Finding the Common Factor:
Upon analyzing the characteristics of each option, we can see that four of the options belong to the same group, while one option stands out as different.

- Snail, Oyster, Spider, and Earthworm all belong to the animal kingdom.
- They are all invertebrates, meaning they do not have a backbone.
- They all have a soft body, except for the hard shell of snails and oysters.

However, Lizard stands out as different from the other options. It belongs to a different group - the reptile group. Lizards have scales, four legs, and a tail, which differentiates them from the other options.

Therefore, the option that does not belong to the same group as the other four is option C) Lizard.