Thank you for posting your question here at brainly. Below are the choices that can be found elsewhere:
<span> A new shoe print
A broken tread
A print made by a blue shoe
All of the above
</span>
The correct answer is the second one which is "A broken tread"
They have a certain shape of active sites which only fit in certain substrates
See lock and key theoru
31 pairs
Spinal nerve, in vertebrates, any one of many paired peripheral nerves that arise from the spinal cord. In humans there are 31 pairs: 8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal. Each pair connects the spinal cord with a specific region of the body.
It is in your text book .
Check in your text book
