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Answer:
Birds have light-weight bones, wings, and feathers that are hollow that allow them to fly. The type and shape of their beaks help them to fulfill their duties in the environment.
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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:
Sunflowers can take up high concentration of radioactive isotopes and sequester them in stems and leaves hence, they have been employed to clean up contaminated sites following nuclear disasters.
Explanation:
It is polymerase chain reaction hope this helps
Contour plowing created grooves in the soil. Because the bottom of each groove is at the same elevation throughout its length, rainfalls will get trapped in each groove instead of running rapidly downhill toward the stream, carrying the top soil with it
hope this helps
