A(n) is a tentative, testable statement about the natural world that is capable of being supported or refuted by scientific evidence, whereas a(n) is a well-established and highly-reliable explanation of a natural phenomenon.

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.