What would happen if there was no Antarctic Landmass?

I understand that Antarctica plays a large role in driving ocean currents and thus the climate of the planet. However, I'm curious what the world would be like if there was no Antarctic landmass at all and the only thing at the southern polar reaches of the planet was water?

I'm sure there would be less penguins, but how else would the world be different?

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What would happen if there was no Antarctic Landmass?

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