Yes. The Drake Passage (as the gap between the two continents is known) is believed to have opened about 41 million years ago. Before that time, Antarctica was much warmer and likely did not have an ice cap.
Yes Antarctica was once connected to the south-coast of Australia. People are well-informed about sea-floor spreading in the Atlantic, but they are often surprised to learn that sea-floor spreading occurs in the Pacific as well. The Australian plate shares its boundary with the Antarctica plate demonstrating that they were connected. It is a fact to be kept in mind that the continental crust is far older than oceanic crust, therefore, the continents must have all been connected in the past. The Siberian/European plate is connected to the North American plate at the top of the globe and in order for the tail of South America to wrap around the cape of South Africa, we necessarily must conclude that the globe was smaller than it is at present.
Parts of Antarctica are claimed by many different countries. Australia does claim a segment of Antarctica
The eastern part of Antarctica faces Africa and Australia.
Australia 'has' no part of Antarctica. The country claims part of the continent, as you can read in the link, below.
Australia does not own any part of Antarctica. No other country owns any part of Antarctica. However, Australia does have a claim on 42% of the Antarctic, which was transferred to Australia in 1935.
Argentina, Australia, Antarctica are in the Southern Hemisphere
Asia, Australia, and Antarctica are not in the Northern and Western Hemispheres (together). Separately, Asia is a part of the Northern while Antarctica is a part of the Western.
Australia claims a slice of Antarctica, but does not own it. There are other claims, and no country with claims owns any part of Antarctica.
Australia may have a territorial claim on the Antarctic continent, but it does not control any part of it.
Australia claims part of Antarctica, but owns none of it, nor does any other country with territorial claims on the continent.
Australia part of Asia part of Africa part of Antarctica
The continents in the Eastern Hemisphere are Europe, Africa, Asia and Australia.The continents in the Southern Hemisphere are Australia, Antarctica and part of Africa and South America.Africa, Antarctica, Asia, and Australia.
All of Australia and (practically) all of Antarctica (except for the infinitesimal point corresponding to the South Pole itself) are between the Equator and the South Pole. Most of South America and a significant part of Africa are also in this region.
Today, the continents of South America, Africa, Antarctica, Australia, the Indian subcontinent, and the Arabian Peninsula were part of Gondwana land.