* Extreme pressure: The pressure at the bottom of the deepest oceans can be thousands of times greater than the pressure at sea level. This extreme pressure can crush the bodies of animals and make it difficult for them to move.
* Lack of light: The deepest parts of the oceans are completely dark. This lack of light makes it difficult for animals to find food and navigate their environment.
* Cold temperatures: The temperature at the bottom of the deepest oceans can be near freezing. This cold temperature can slow down the metabolism of animals and make it difficult for them to survive.
* Lack of oxygen: The oxygen concentration at the bottom of the deepest oceans is very low. This lack of oxygen can make it difficult for animals to breathe.
* Predators: The deepest parts of the oceans are home to a variety of predators, including giant squid, anglerfish, and deep-sea sharks. These predators can prey on animals that are not adapted to the extreme conditions of the deep sea.