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.

Vertebrates are distinguished by the presence of aMultiple choice question.postanal tail.exoskeleton made of bone.vertebral column, or backbone.dorsal nerve cord.

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.

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

What animals lack a backbone?Multiple choice question.invertebratesmammalsvertebratesarthropods

When comparing the vertebral column of mammals with that of reptiles, what two traits unique to mammals are apparent?Multiple select question.vertebral column is straightvertebral column is arched or curvedspines of vertebrae project into the internal cavityvertebrae are highly differentiated