Select the most appropriate one-word substitution for the given group of words.
The class of animals without backbone
Answer & explanation
Correct answer: option 4
The most appropriate one-word substitution for "the class of animals without backbone" is invertebrates.
- Spineless can refer to any animal that does not have a backbone, but it is not a very specific term.
- Biped refers to an animal that walks on two legs.
- Reptiles are a class of animals that includes snakes, lizards, turtles, and crocodiles.
- Invertebrates is a class of animals that does not have a backbone. It includes over 90% of all animal species on Earth.