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Suppose you have the following set of data:

3 cm, 7 cm, 7 cm, 7 cm, 9 cm, 11 cm, 12 cm

What is the median of the data set?

A. 7 cm

B. 8 cm

C. 9 cm

D. 10 cm

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.