<span>Modern sea star larvae resemble some primitive vertebrate larvae and this similarity suggest that the primitive vertebrates share a common ancestry with sea stars
it means their ancestors shared some common features so that is why it resemble primitive vertebrate larvare
hope it helps</span>
Each lung consists of millions of tiny air sacs called alveoli.
<span>Each air sac is surrounded by a tiny blood vessel called an </span>arteriole.
I think the question needs to choose one from the last four lines. They are distantly related so their development is similar. They have different genetic materials. But they have similar structure of body. So they have similar embryo. And they are both vertebrate.
