Which of the following describes a response of external stimuli
1 a rabbit runs away from a fox that is chasing it
2 a woman drinks water when she's is thirsy
3 a boy eats food when he is hungry
4 a person yonns with oxygen levels in blood are low

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.