Depending on the niche (habitat) animals on top of that organism on the food chain might eat it.
the organism will die
It Is Bison Because They Are A Organism IsEndangered. Mostly Of Them Are NOT!
This depends on the organisms habitat and the surroundings of the habitat, for example a zoo habitat is well cared for and safe. A rainforest habitat can be in grave danger because of the large population of human beings on the earth. Every habitat is different.
It may have to seek another habitat more suitable or death may be the result.
what might cause a culture today to decline or disappear
The organism(s) will die. Any one of these needs are food, shelter, space, a safe place to raise kids, and/or water. Or the organism might have to move to a different area. That area might contain hostile creatures that would kill the organism, or it might eat something unfamiliar that was poisonous and it would die. There are stories of Jaguars who had been forced out of their home by deforestation. These jaguars are so desperate to survive that they turn to he helpless livestock of local farmers. The farmers then set out to kill the animal, and usually succeed.
you might not have tamed them. Otherwise, it might be a bug.
Carnivores, herbivores and omnivores might share a desert habitat.
it might be good for the organism and benefits the organism
Anything from zero to 100%.
Anything from zero to 100%.