Where do these metals originate? Science students were tasked with completing the Venn diagram to distinguish between natural occurrences and occurrences due to human activities. There was great debate among the students. Can you help them out? Where
should these metals be placed and why?
A.
Heavy metals occur naturally in underground rocks and soils and leach into groundwater.
В.
Human activities such as mining and construction can release large amounts of heavy metals into nearby groundwater sources.
C.
Increased urbanization and the associated human activities are to blame for an increased levels of heavy metals, in our waterways.
D.
Heavy metals occur both naturally and as a result of human activities. They occur natural in rocks and soil and are the by-products of a multitude of h
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Read the following scenario to answer the following question. 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. when most populations of a wide-ranging amphibian species are lost and the few remaining populations are widely separated, we expect to see that a. the founder effect becomes increasingly important b. microevolution no longer occurs c. gene flow between populations is reduced d. artificial selection becomes a greater factor in microevolution

15 ! come and answer! a(n) is the general term for an infectious disease that has spread across a city, region, or country.

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion