How can marine animals reach the deapest parts of the ocean but humans can’t?

Question: How can marine animals reach the deapest parts of the ocean but humans can't?
- Keywords:
  animal,
  marine,
  ocean
Asked by 457sprg52 to Katy on 8 Nov 2016.
- Katy Griggs answered on 8 Nov 2016:
  
  Great question. Marine animals that are able to reach the bottom of the ocean have evolved so physiologically they can cope with the environment. At the bottom of the ocean its incredibly cold (-1 to 4C), pitch black darkness and the pressure is thousand times the standard atmospheric pressure at sea level. The human body would not be able to withstand this pressure. Humans have never needed to able to live at the bottom of the ocean so we have not evolved to cope with these environments.

Question: How can marine animals reach the deapest parts of the ocean but humans can't?