Understanding Animals with Backbones (Vertebrates)

Animals can be broadly classified into two main groups based on the presence or absence of a backbone (spinal column). Animals that have a backbone are called vertebrates, and those that do not have a backbone are called invertebrates.

Vertebrates belong to the subphylum Vertebrata within the phylum Chordata. This group includes fish, amphibians, reptiles, birds, and mammals. The backbone provides structural support and protection for the spinal cord.

Examining the Given Animals

Let's look at each animal listed in the options to determine if they possess a backbone:

• Rabbit: Rabbits are mammals. Mammals are vertebrates, meaning they have a backbone. You can often feel the spine along a rabbit's back.
• Squirrel: Squirrels are also mammals. Like all mammals, squirrels have a bony spine or backbone running along their back, providing support and protection.
• Snake: Snakes are reptiles. Reptiles are vertebrates. Snakes have a very flexible backbone made up of many vertebrae, which allows them to move and slither in different ways.

Based on this analysis, all the animals listed – Rabbit, Squirrel, and Snake – belong to the group of vertebrates because they all possess a backbone.

Conclusion

Since Rabbit, Squirrel, and Snake are all animals with backbones, the option "All the above" correctly identifies animals from the list that have a backbone.