It would depend on the nature of the environment. Platypuses are specially adapted to live in freshwater creeks and rivers within bushland or rainforest. As long as they had access to clear, freshwater rivers and creeks where they could feed and dig their burrows, and some tree shelter overhead, they could (arguably) survive.
Sure, they are in zoos all over the world. That is a different environment.
If the environment was very similar to Earth, yeah. Otherwise, no.
A simile for a platypus could be "as unique as a platypus in a pond." This simile highlights the distinctive nature of the platypus as an unusual and fascinating animal that stands out in its environment. It draws a comparison between the platypus and something equally rare or extraordinary.
A jellyfish requires a marine environment to survive and could not live in a barren desert.
So they could survive.
No. A platypus is not designed for circus tricks.
A platypus can roll in the water if it chooses, but it is unlikely that it could roll on land.
You can't become an actual platypus. Unfortunately, that requires different DNA. However, I am sure that you could find a Platypus costume if you want to commune with your inner platypus.
Depends on the ecosystem, The grizzly could survive another ecosystem, only if they can adapt to the changes or evolve. if they cannot evolve with the systematic changes : they will die off.
Their environment changed and they could no longer survive.
A male platypus could kill a cat. It would have enough venom in its spur to achieve this. A female platypus does not have a venomous spur.
Without plants producing oxygen, society could not survive. Plants also provide beauty to the environment.