Question

select all that apply
select all the chordates that have neither a cranium nor vertebrae.

tunicates
lampreys
amphibians
sharks
lancelets
snakes

Explanation:

• Tunicates: They are invertebrate chordates. They lack a cranium and vertebrae.
• Lancelets: They are also invertebrate chordates. They do not have a cranium or vertebrae.
• Lampreys: They are vertebrates (have vertebrae in the form of a notochord - derived structure in adults).
• Amphibians: They are vertebrates (have vertebrae).
• Sharks: They are vertebrates (have vertebrae made of cartilage).
• Snakes: They are vertebrates (have vertebrae).

Answer:

tunicates, lancelets