My systematic brain says I can span the two dimensions: science book procedures and painting skill conventions.10

Quite flexible, I switch between a microscope and brush;11

I find that others tend to choose and stick with only one.12

What do the microscope and brush symbolize, respectively?

A) The microscope represents science, and the brush represents art.

B) The brush represents science, and the microscope represents art.

C) The brush and microscope both symbolize different colleges the author wants to attend.

D) The microscope symbolizes the author's desires, and the brush symbolizes his inspiration.

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

The picture shows a fishing technique called trawling. how might trawling affect marine biodiversity

All other things being equal the size of a population will decrease if