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.
Answer:
The chromosomes inroduces carbon factors
Explanation:
The most abundant source of methane in the globe is coal-fired power plants.
Answer:
They should all have purple flowers.
Explanation:
This is because plants use the reproduction called mitosis, which means that the child will be a direct copy of the parent.
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