Describe how poaching of mountain lions in Colorado could change the ecosystem.
Mountain lions are a keystone species in the Colorado ecosystem. This means that if they are removed, drastic changes will take place. Mountain lions help to keep the deer and elk populations in check. If there were less mountain lions, there would be more of these herbivores, which would in turn increase the competition for plant based sustenance.
Is the green house effect positive or negative for humans?
While many people argue that the green house effect is negative for humans because it influences climate change, we cannot overlook the fact that humans would not be able to live on Earth without it. The green house effect traps heat while also filtering out a portion of harmful UV rays. It also helps to keep our temperature consistent. There is great evidence of this when you compare the average high and low temperature on Earth to other planets.
Scientists often use multiple techniques to determine the age of certain objects depending on the technology they have available. Describe which technique a scientist in the field might use to date a bone that was dug up using a shovel (assume this is the only technology available).
Because this scientist has limited resources, the technique of relative dating would be most appropriate. The scientist could determine the depth of the object, and then determine whether it is older or younger than objects above or below the original object.