There are at least 24 major deserts in the world and a number of smaller deserts.
Yes, there are caves in many deserts around the world.
No, many deserts around the world are expanding, not receding.
in deserts around the world
Yes, beetles are fairly common in deserts around the world.
Yes there are a variety of wildcats that are natives to deserts around the world.
There are a number of snake species that live in deserts around the world.
Yes, the deserts around the world have a number of species of lizards.
There are deserts spread around the deserts of the world in a multitude of time zones and cultures. There is no single answer to this question.
By 'they' I assume you mean people. Yes, millions of people around the world live in deserts, including the author of this answer.
There are deserts located in many places around the world. These include North America, South America, Africa, Australia, as well as Asia.
Millions of people around the world live in cities and towns located in deserts.
Many of the deserts around the world form in mountain rain shadows.