The incidence of MRSA, methicillin-resistant Staphylococcus aureus, has increased in the last twenty years. The rise of MRSA strains is significant, and MRSA infections are often developed within the hospital system rather than outside of them. In terms of how MRSA strains developed, evaluate each statement below. Choose the statements that accurately describe how MRSA strains occurred. You may select ALL that apply. A) Individuals that are admitted to the hospital are likely already carrying MRSA infections.

B) Hospitals treat patients with MRSA with drugs that cause the Staphylococcus aureus to mutate more rapidly.

C) Hospital systems provide a mechanism for extreme selection pressure with sterile technique and heavy use of antibiotics.

D) Staphylococcus aureus can transmit genetic components containing the methicillin resistance to offspring and other members of the population.

E) Staphylococcus aureus that was already genetically predisposed to be resistant to methicillin existed in small proportions of the original population. Eliminate

Over the past 60 years, many amphibian species have experienced significant population declines and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. chytridiomycosis is a fungal disease first identified in 1998 as a cause of massive amphibian deaths. in some severely impacted populations, a few individuals have survived, perhaps because of some natural resistance. if these resistant individuals continue to survive and prosper, new resistant populations might emerge. this would be an example of the founder effect artificial selection genetic drift natural selection sexual selection

How does this experiment explain why it is often milder in areas such as coastal maryland while areas such as kansas or iowa have more extremes in temperature

Organisms that successfully adapt will leave to grownone of the above