Question

what do all vertebrates and invertebrates have in common?
they are prokaryotic.
they are covered by an outer skeleton.
they are multicellular.
they are bilaterally symmetrical.

Explanation:

• Vertebrates and invertebrates are both animals. Animals are eukaryotic (not prokaryotic), so the first option is wrong.
• Only some invertebrates (like arthropods) have an outer skeleton. Vertebrates have an internal skeleton, so the second option is wrong.
• All animals (vertebrates and invertebrates) are multicellular.
• Some invertebrates (like jellyfish which are radially symmetrical) are not bilaterally symmetrical. So the fourth option is wrong.

Answer:

They are multicellular.