What is an oder word for hard to survive?

What are some of the challenges that conservations face? Is tiger threatened or endangered in India? Are possums in New Jersey marsupials? What animals might you see in Costa Rica that you will not see in the US? What are the characteristics in Savannah grassland? What would most likely happen in the ecosystem if many people carelessly trampled the tundra and killed off the plants? A group of Aye ayes is called? Can species that become extinct be replaced? What three factors determine aquatic biomes? What consequences does the purple loosestrife have on people? Are apes endangered? Are elephant birds extinct? How do you get rid of tics in your house? What tundra animals compete for resources? Are cave bears and short faced bears the same thing? Which of the following is the best definition of a hazard? Why are the basilisk lizards endangered? Where are moose endangered? Are pyrenean desmans endangered? Can captive breeding programs only be done in the US?