Electron microscopes can reveal detail a. only in specimens that are still alive. b. about the different colors of cell structures. c. of cell structures only once they are strained. d. 1000 times smaller than those visible in light microscopes.

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.