Scientists use the scientific method to ensure their studies…

Scientists use the scientific method to ensure their studies are reputable and valuable. This requires that they make observations and propose a hypothesis or series of hypotheses (untested ideas) to test a particular theory—a thoroughly tested idea). For instance, Wegener’s hypothesis of continental drift was backed by evidence and observations, but the evidence was controversial and Wegener couldn’t offer a persuasive explanation of how continents could actually move. So his hypothesis was generally rejected. New observations and evidence, such as the volcanic eruptions along mid-ocean ridges and the subduction of oceanic crust beneath trenches, explained the motion of Earth’s plates (rather than the continents themselves, as Wegener had hypothesized). Similarly, after several observations and testing, the Big Bang emerged as an explanation for the development of the universe.   Each of the following is either a hypothesis, theory or observation.

Do you acknowledge that this course is built on teamwork and…

Do you acknowledge that this course is built on teamwork and collaboration, and do you acknowledge that you will contribute fairly to the group to which you are assigned? Further, everyone in a group will receive the same grade on group assignments – you must also acknowledge that you will work in a shared document and review everyone’s work so the entire team is on board with each submission. 

Of the 30 years in life expectancy gained in the United Stat…

Of the 30 years in life expectancy gained in the United States from 1900-1999, public health improvements as outlined in the CDC’s “Ten Great Achievements in Public Health 1900-1999”, as opposed to advances in medical care, are believed to have contributed how many of those years?