Question

1. cephalochordates have a backbone that extends from their tail to where?

○ their anus
○ their gills
○ their head
○ their heart

Explanation:

Cephalochordates are invertebrate chordates with a notochord (the structure referenced here as a backbone) that runs the full length of their body, extending from the tail region up to their head, persisting throughout their lifespan.

Answer:

their head