The adaptive immune system, also known as the acquired immune system or, more rarely, as the specific immune system, is a subsystem of the overall immune system that is composed of highly specialized, systemic cells and processes that eliminate pathogens or prevent their growth. The acquired immune system is one of the two main immunity strategies found in vertebrates (the other being the innate immune system). Acquired immunity creates immunological memory after an initial response to a specific pathogen, and leads to an enhanced response to subsequent encounters with that pathogen. This process of acquired immunity is the basis of vaccination. Like the innate system, the acquired system includes both humoral immunity components and cell-mediated immunity components.

is adaptive immunity the same as acquired immunity?

A: yes

On May 14, 2017, the series was renewed for a third season, which premiered on April 25, 2018. On May 24, 2018, CBS cancelled the series after three seasons. The series finale aired on July 18, 2018.

was this the final season of code black?

A: yes

The twelfth season of the American television medical drama Grey's Anatomy was ordered on May 7, 2015, by ABC. It premiered on September 24, 2015, in the United States on ABC. The twelfth season includes the show's 250th episode, Guess Who's Coming to Dinner, which is the fifth episode in the season. The season is produced by ABC Studios, in association with Shondaland Production Company and The Mark Gordon Company; the showrunners being Stacy McKee and William Harper. The season commenced airing with the episode ''Sledgehammer'' and concluded with ''Family Affair''.

is grey's anatomy coming back for season 12?

A: yes

Canadian law requires that all persons entering Canada must carry proof of both citizenship and identity. A valid U.S. passport or passport card is preferred, although a birth certificate, naturalization certificate, citizenship certificate, or another document proving U.S. nationality, together with a government-issued photo ID (such as a driver's license) are acceptable to establish identity and nationality. However, the documents required to return to the United States can be more restrictive (for example, a birth certificate and photo ID are insufficient) -- see the section below on Return entry into the U.S.

can you enter canada from us without a passport?

A:
yes