The survival of nerve cells, as well as their performance of some specialized functions, is regulated by chemicals known as neurotrophic factors, which are produced in the bodies of animals, including humans. ███
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The primary function of the █████ █████████ ██ ███ ███████ ██ ████████ ██ ███ ██████ █████████ ██ ██
indicate that conclusions ████████ ██ ██ ███ ██████ ██████████ ██████ ███████████ ████████ ███████ ███████ ████████████
Not supported, because nothing in P3 suggests that we have to verify experimental results described in P2. P3 describes later research and provides additional details about the role of NGF and growth factors.
indicate that conclusions ████████ ██ ██ ███ ██████ █████████ ████ ████ ██████████ ██ ████████████ ████████ ████████
Not supported, because nothing in P3 suggests that results described in P2 have been undermined. P3 describes later research and provides additional details about the role of NGF and growth factors.
indicate ways in █████ ███████████ ████████ ██ ██ ███ ██████ █████████ ████ ████ ███████ ████████████ ███ ███████
This is the best answer. P3 shows that other research has found other growth factors. It also describes more specifically the function and role of NGF and other growth factors. It’s fair to characterize this as corroborating and refining the conclusions reached by Levi-Montalcini in P2.
describe subsequent discoveries ██ ██████████ █████████ ██ ███ █████████ █████████ ██ ███ ██████ █████████
This is too narrow to be the primary purpose of P3 in relation to P2. Although the author does mention other growth factors, the author doesn’t specifically identify them or how they were discovered. The focus of P3 is on the the role of NGF and growth factors, as shown by research following the discovery of NGF.
indicate that experimental ██████████ █████████ ██ ███ ██████ █████████ ████ ████ ██████████ ██ ████ ███████ ██████████ █████████ ██ ███ █████ █████████
Not supported, because nothing in P3 suggests that experimental procedures described in P2 have been replaced by other techniques. P3 describes later research and provides additional details about the role of NGF and growth factors.