Journeying into this unexplored world gives us an insight into the creatures that thrive in such __________ conditions and off ers scientists a unique view of life on the sea bed: vital for future conservation work to protect the sea bed

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Journeying into this unexplored world gives us an insight into the creatures that thrive in such __________ conditions and off ers scientists a unique view of life on the sea bed: vital for future conservation work to protect the sea bed.

1. extreme
2. hard
3. painful
4. awful