Question

list the features that all vertebrates show at some point in their development

Answer 1

1. in these animals, notochord is replaced by vertebral column.
2. in these animals, head is well developed.
brain is protected by cranium.
3. endoskeleton is either cartilegenous or bony.
4. some chordates are jawless( AGNATHA) whereas some are with jaws(GNATHOSTOMATA).
HOPE IT HELPS......

Answer 2

There are three key features that all vertebrates show at some point in their development namely  

• Notochord
• Tubular nerve chord

• Pair of gills slits in the pharyngeal region.

• A post-anal tail

EXPLANATION:

Animals in the "phylum Chordata" provides four main features which appear at certain stage during their development: a 'notochord', a dorsal hollow 'nerve cord', 'pharyngeal slits', and a 'post-anal tail'.

In these animals, notochord is replaced by vertebral column. Head is well developed.