Final answer:
Adopted children can be adopted through the foster care system, through informal adoption and sponsorship, or internationally.
Step-by-step explanation:
Adopted children can be adopted through the foster care system, through informal adoption and sponsorship, or internationally. Across cultures, informal adoption and foster care have long been practiced to provide opportunities for young people and strengthen families. In addition, there are millions of children in foster care who are waiting for adoption, and many of them have been in the system without a permanent family for several years.