Misc: A white mtallic element?

Questions

In Korea, the _____ is a symbol of long life, and is often portrayed in the company of immortals?

Cougars can kill animals ______ times their size?

The venom of the king cobra is so deadly that one gram of it can kill ______ people?

The Virginia opossum is the only marsupial (pouched mammal) indigenous to __________?

The Virginia opossum have a litter size of up to ____?