(Question)
Q: What type of force exists between two touching surfaces? Choices: - opposing - centrifugal - tension - friction A:
(Answer)
friction

(Question)
Q: In physics, the number of waves that pass a fixed point in a given amount time is referred to as what ? Choices: - combination frequency - wave count - creation frequency - wave frequency A:
(Answer)
wave frequency

(Question)
Q: What can ultimately result when species are introduced to a new place and prey on other species? Choices: - depletion - over population - elimination - extinction A:
(Answer)
extinction