fire, impact, etc.
fire and heat
Disease
One of the greatest threats to the world's drinking water supplies ... which contaminate drinking water supplies (groundwater supplies).
ied,stowaway,cargo
Foxes eat numbats. They are one of the greatest threats to numbats, which are small, defenceless creatures.
People who are so stupid they have to ask about it on wiki anwers
Dogs, foxes and feral cats are some of the greatest threats to bilbies.
People
High-Yield Explosives
Over population and climate change are the greatest threats to agricultural sustainablility.
top to bottom 4, 1, 3, 2
because employees use data in everyday activities to conduct the organization's business, their mistakes represent a serious threat to confidentiality, integrity, and availability of data and even threats from outside.