What characteristic is NOT true of animals?

All ___ lack a skull and a backbone.

Any animal with a skull and a backbone is classified as ___.

Scientists have named about one million species of animals. Most of them are ___, meaning they do not have a backbone.

Which of the following is a vertebrate?

Which of the following is an invertebrate?

A natural sponge is a(n) ___.

One-fourth of all animals species are invertebrates called ___.

Less than 5% of known animals species are ___.

The majority of the known animals species are invertebrates called ___.

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