Greetings!
I'd be glad to help! This reminds me of the old joke, "how do you eat an elephant? ... one bite at a time!" Let's take it one bite at a time to make it more manageable.
"In the period of exclusively Indigenous settlement of Australia, economic development involved humans adapting to Australia's geography." - I've never visited Australia, but my understanding is that it is, over much of the continent, a very wild place, full of inhospitable weather and hazardous wildlife. This means that it was necessary for the natives to learn to deal with what nature presented them, and try to turn it to their advantage -- or at least, keep it from killing them! You'll have to do some research to learn how the indigenous people managed this.
Now, let's look at the second half, "in the period of European settlement, Australia's geography has been forced to adapt to economic development." - As technology advanced, so did humans' ability to control the environment. I know that in America, for instance, great rivers were tamed by dams to control flooding and provide a water resource for growing cities. I would imagine it's similar in Australia. Where there's development, forests are cleared, mountains are blasted, lakes are formed by dams, roads cut through previously unoccupied (except for wildlife) areas, which, as we now know, has a big impact on the environment; it changes the geography of the land.
I hope this helps give you some ideas for where to start! Best of luck!
Thanks,
Sarah, EssayForum.com
Sarah, EssayForum.com