The development of machines to do simple and not so simple tasks, such as robotics and computers, has had many influences on society. Some of these have been positive and some of them negative. Which statement describes a negative aspect of mechanical technological advances? A) fewer available jobs
B) lower prices for goods
C) less waste in production
D) lower cost of manufacturing

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 the author's purpose in this passage differ from an author writing about her personal struggle living with asthma?

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere