The animals without backbones are called _____.
strong
complex
vertebrates
simple
invertebrates
invertebrates
_____ symmetry is exhibited by all vertebrates.
Bilateral
Radial
Composed
Circular
Simple
Bilateral
The correct answer is "invertebrates." To get the answer, you can start by understanding the definitions of the terms provided in the options.
"Strong" and "complex" are not relevant to the question and do not describe the category of animals without backbones.
"Vertebrates," on the other hand, refers to animals with backbones (such as mammals, birds, reptiles, amphibians, and fish). Therefore, it is the opposite of what we are looking for.
The term "simple" does not specifically relate to the presence or absence of a backbone in animals.
Finally, "invertebrates" is the correct term for animals that do not have a backbone. Examples of invertebrates include insects, spiders, worms, jellyfish, and mollusks.