How deep is the Mariana trench

How are shrimp and other animals able to not be crushed by the1000x greater pressure at the bottom on the Mariana trench?

Wiki says the trench is home to "large living creatures such asa sole or flounder about 30 cm (1 ft) long, and shrimp"

I understand natural selection, but what features has evolution"selected" that enable soft flesh and bones to not be instantlycrushed like our own skulls would be at that depth?

Which of the following is a viral disease that has most of its effects in and around the oral cavity?

Trench mouth

Gingivitis

Hepatitis

Mumps

Thrush