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The primary purpose of the passage is to
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According to the passage, since the early 1990s, sea urchins in the waters east of Cape Hangklip have
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The conservationists` recommendation as described is based on which of the following assumptions?
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One of the reasons why many early British colonies in North America failed amid the New World`s abundance was that the settlers` mindset prevented them from living like the native inhabitants. From Native Americans, the settlers learned such skills as building brushwood weirs to trap fish, but they did not adopt the real key to success: mobility. The whole intellectual foundation of European civilization was fixity--a worldview profoundly different from that of Native Americans, who moved in response to changing food resources. Settlers were drawn to North America by tales its extraordinary abundance, not realizing that abundance is seasonal. Culture and ecological knowledge allowed Native Americans to exploit different food sources at different time of year.
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In order to choose between the two hypotheses, it would be most useful to determine which of the following?
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The author of the passage mentions black holes in order to provide
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In general, naive individuals appear more likely to learn from interaction with familiar rather than unfamiliar members of their species. Kaveliers and colleagues (2005) reported that naive laboratory-bred deer mice showed greater social learning of defensive responses to biting flies after observing responses of familiar members than after observing responses of unfamiliar members. Earlier, Valsecchi and colleagues (1996) reported striking differences in social learning of food preferences among Mongolian gerbils, depending on whether they were exposed to familiar or unfamiliar demonstrators. At the time, this was unexpected because Gaief and colleagues (1984)had previously reported no familiarity effect in Norway rats on social learning of food preferences. However, Gaief et al (1998) subsequently uncovered a significant familiarity effect that was evident when demonstrators are some hours before interacting with observers but absent when demonstrators are immediately before interacting.
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