animals are broken down into two major groups, what are they?

Answer 1

I believe it is vertebrates and invertebrates

Answer 2

If you want to get technical, the very first division made among animals is between the parazoa and the eumetazoa (this is a 'subregnum' or 'subkingdom', falling between kingdom and phylum in classification). Parazoans don't have tissues of any kind... the only living parazoan is the sponge. So I suppose this might not be considered a 'major' group.

Eumetazoa has at least three subgroups: placozoa (asymmetric, like the tricoplax), radiata (radially symmetric, a disputed group), and bilateria (bilaterally symmetric, like darn near everything else). If we've only gotten this far because parazoa isn't major, I don't suppose you'll think that placozoa and radiata are major either.

Whether or not you thought the above ones were major, the next branching certainly is. Bilateria is split into at least two groups, which are the deuterostomia and the protostomia (these are superphyla, so we're STILL between kingdom and phylum).

The defining characteristic that distinguishes these two groups occurs in embryonic development - in protostomes the first opening becomes the mouth (this group includes all insects and most worms) and in deuterostomes the first opening becomes the anus (which includes everything with a spine, starfish, and the rest of the worms). By species count, the protostomes are the far more numerous of the two!

Hope that helps!

Answer 3

Vertebrates and Invertebrates?

Answer 4

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Answer 5

ceolomates are broken down into Protostomes and deuterostomes

Answer 6

Vertebrates and invertebrates......
learned that in 2nd grade budyy....literally.
u need to study....

Answer 7

it IS vertebrates and invertebrates

Answer 8

Those with Spines, and those that are spineless.

Answer 9

verts and inverts

Answer 10

humans and seacreatures.