The setting of my story is a harsh desert land, with temperatures consistently exceeding 50 degrees Celsius. There are small ponds that exist, though very rarely. Water is in tight supply.
The flora population comprises of sparse desert shrubbery such as cacti and other typical arid plants. Oases are few and far between.
For the purposes of this world, life has been evolving for millions of years, to a point that there are dominant (bi-pedal or otherwise) sentient beings that have discovered things like fire and wheels.
Based on the comments, I've narrowed it down to the kangaroo (or marsupials in general). The question, then, is two-fold:
- Can kangaroos evolve and become the dominant sentient species of my imaginary planet?
- What would be the evolutionary route taken by the kangaroos?
The requirements to qualify as "dominant sentient species" for my question are: 1. Human level or near-human level intelligence 2. Ability to discover and interact with technology 3. Social cohabitation and ability to live with others of the same species in sufficiently large groups
Presumptions and pointers: 1. There has been sufficient time for evolution to take its course, 2. Some degree of hand wavium is not a problem but magic can't be the reason for evolution.