What effect did colonization have on Australia's indigenous population

The colonisation effected the inidenious population by spreading a wave of diseases. This was including measles and smallpox which effected many Indigenous. Not unless you were looking for when the colonisation ruptured the ecosystems in Australia which also exposed new organisms. These organisms did wipe out others, the European colonisation brought a huge amount of diseases with them, wiping away the Indegenous in 1798.

i would say your answer is a)

sorry if im wrong