What animals lack a backbone?Multiple choice question.invertebratesmammalsvertebratesarthropods

An invertebrate is an animal thatMultiple Choicedoes not have a backbone.has a backbone.has a complete digestive tract.has an incomplete digestive tract.does not have true tissues.

Which of our 9 groups of animals does NOT contain invertebrates?Group of answer choiceschordatesannelidsmolluscsarthropodsnone of the above

The two broad groups that animals have been divided into based on the presence or absence of a backbone areMultiple choice question.roundworms and flatworms.autotrophs and heterotrophs.vertebrates and invertebrates.deuterostomes and protostomes.

Animals that have ______ are called vertebrates, and those without are called invertebrates.Multiple choice question.deuterostome developmenta dorsal nerve cordnotochordsbackbones

A vertebrate is an animal thatMultiple Choicehas a cranium but lacks a vertebral column.does not have a backbone.has a vertebral column.has an incomplete digestive tract.does not have true tissues.