Echinoderms have _____.
- triangular symmetry
- radial symmetry
- hexagonal symmetry
- pentaradial symmetry
The circulatory fluid in echinoderms is _____.
Which of the following features does not distinguish humans as a member of phylum Chordata?
- Human embryos undergo indeterminate cleavage.
- A spinal cord runs along an adult human’s dorsal side.
- Human embryos exhibit pharyngeal arches and gill slits.
- The human coccyx forms from an embryonic tail.
The sister taxon of the Chordata is the _____.