Plutonium, a radioactive metal. However, it takes some time to work. In biotoxins, it would be hard to beat the botulinum toxin.
VX Poison GasUsed in the film "The Rock"
the sea wasp
Sea Wasps, or Box Jellies.
the one that kills you
Chengiz Khan
Appenzeller (Stinky)
No dog can be classed as the deadliest. It depends on the training they receive.
in history, the deadliest army is the assyrian army and now i believe it is the usa
Chun Li
Mushroom
The world's most deadliest animal is the mosquitoe, because of all the diseases it carries.
Poison dart frogcrocodile