What does threat to diversty mean?

Why coal mining is dangerous? How many rock hopper penguins left in the wild? What is the size of the south china tiger? What happen when some living organisms in the food pyramids become extainct? Are sunfish endangered and why? What is the superstition about aye-ayes? Why is the Laysan Duck endangered? Why is biodiversity in Ontario at greater risk in the south than the north? Are bonobo chimpanzees endangered? Why is cheatgrass only considered a threat in the Western US? Cloning endangered species is a good idea what effect might this have on an ecosystem? How do you know how long your cycle is? What are the characteristics of a Wildflower in the desert? How does extinction of species today differ from extinction in the past? How komodo dragons lay eggs? Are any species endaned on galapagos islands? How do you know if the cougar is endangered? Why was ddt use? What mineral resources of Virginia can be conserved by doing all of the following? What are methods to identify work plsce hazzards?