acid rain is made by sulphuric acid which is toxic for human and water and land species.
when acid rain reaches the pond, the acid will mix with H20. the biodiversity will likely become mutant.
The first generation of offspring in Mendel's experiment is called "F1".
Controlled population growth.
Explanation:
US is a highly developed country and it has expansive infrastructure and highly mechanized agricultural equipments. So first option is not a choice. Second, access to chemical fertilizers and pesticides in a country with such advanced agriculture infrastructure is very easy. Third US is well known for using GM crops.
US does not have a controlled population growth because if not the birth rate then migration of people to US is a major concern for that country. Thus, this will be a correct choice for the given question.
The answer is A: a flagship species.
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