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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"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

1. b.

2. d.

3. a.

5. d.

6. c.

these are the only ones that i know, i hope this , and good luck.