In the 1500s, most people in australia spoke which language?

In the 1500s, most people in Australia spoke aboriginal languages. The Aboriginal Australians were the indigenous peoples of Australia, and it is only natural that their language was the first one to be spoken in these areas. Japanese was never spoken in Australia, Maori was spoken in New Zealand, and English came later on in history.

I'm pretty sure it's c. extremely gradual but not 100% sure though.

The figure is not necessarily a parallelogram because only one diagonal is bisected and only one pair of sides is congruent.