Write the correct relative pronoun (who, which, that, whose, where) to complete the following sentence:

Bird flu, ___ evolved in Chinese hen houses, spread across Asia, took up residence in a few migratory ducks and has now arrived in Europe.

Write the correct relative pronoun (who, which, that, whose, where) to complete the following sentence:

She works part time at a shelter for teenagers ___ are recovering from alcohol or drug abuse.