Proteins that help to identify a cell as self vs. foreign are also known as antibodies.
antibodies.

immunity.
immunity.

clotting factors.
clotting factors.

antigens.

Which of the following is true about the introduction of a non-native species to an environment? (a) they usually adapt quickly so they can have a positive affect on the environment. (b) they can disrupt the environment and cause much damage and devastation to native species. (c) they usually become predators in a food chain and to keep prey populations under control. (d) because the native species are better-adapted to the environment, the non-native species always end up dying out.