Nope - they have no internal skeleton.
Yes, all mammals are vertibrates.
Yes, elephants have backbones, so are vertibrates.
no
yes, it is a mamal and all mamals are vertibrates and all vertibrates have backbones
Backbones
vertibrates
Of course they are!
yes
facts about flatworms
Yes they are vertabrates. They are fish and fish are vertibrates. Fish, Reptiles, Amphibians, Mammals, and birds are all vertibrates.
Yes flatworms are invertebrates
they are vertibrates