what percentage of the creatures on earth do not have a backbone?

Question

please include your references if you have any

also if you know any of these questions feel free to answer

How many bones are in your face?
Who has more bones in their necks--humans or giraffes?
How many joints do you have in your body?
What are the 2 types of bone? What is the difference between the two?
What is at the center of bones? What is its purpose?
What is in between each vertebrae and what purpose does it serve?
How many vertebrae do humans have?
How is a human spine different from most other mammals? How does this difference benefit humans?
What are the three types of vertebrae?
What is another name for the breastbone?
How many pairs of ribs do most humans have?
What connects the ribs to the sternum?
What protective function does the ribcage serve?
How many bones do you have in your foot?
Where are your tarsal bones? (They're in two different places).
Where are your metatarsal and phalange bones?
How does the arch in your foot help you?

I no longer need this question....

answer the question--

What are the two types of bones?What is the difference between the two?

i no longer need that question

answer this

where are over half the bones in your bodies located?

Answer 1

97% of all animals are invertebrate. That's all I'm doing for you.