PLEASE HELP ME NO BOTS PLZ

The american academy of pediatrics wants to conduct a survey of recently graduated family practitioners to assess why they did not choose pediatrics for their specialization. provide a definition of the population, suggest a sampling frame, and indicate the appropriate sampling unit.

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.

2and 3 are angles. complementary vertical congruent supplementary