Yes. Sand boas are vertebrates as are all snakes.
dessert
I say that some types of birds eat Sand Boas
Dry places in middle east
20 years or longer
No. Boas are constrictors and kill their prey via suffocation.
rosy boas live for about 20 years. i am not positive from this....
It depends what kind of boa. Red tailed boas reaches 7 ft or so sand boas reaches only 32 inches. Hope this answers your question.
Boas in general are not close to extinction by any means, but some specific ones like a subspecies of Sand boa (don't remember off the top of my head) are endangered).
Some do. The sand boa (all subspecies) is a burrower along with Rosy boas and some others. The Red tail boa (which is probably what you're thinking of) is semi arboreal to arboreal and does not burrow.
in sand
yes, thery rattle - to distract the enemies from attacking it's head, which it noramally burrows into sand.