The backbone is a characteristic of

Yₒᵤᵣ ₐₙₛWₑᵣ ᵢₛ .:

Back bone (or vertebral column) is the character of all the species included in .:

Sub-phylum VERTEBRATA

of

Division CRANIATA

of

Kingdom ANIMALIA

answer; ///(statins)/aka as hmg coa

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.