Periodic wind shifts cause extended dry spells on Plazos every year, putting the larger iguanas, whose bodies require relatively more water, at a great disadvantage.

　　 There are exactly three species of iguanas on Plazos but only two species of seagulls that feed on iguanas, and a relatively small percentage of each years hatchlings are consumed by seagulls.

　　 Wild cats, which were introduced as pets by early settlers and which were formerly major predators of Plazos iguanas, were recently killed off by a disease specific to cats.

　　 The iguanas on Plazos are a relatively ancient part of the islands animal life.

　　 Both land and marine iguanas live on Plazos, and the land iguanas tend to be larger than marine iguanas of the same age

　　7. Every human being who has ever lived had two parents. Therefore, more people were alive threethousand years ago than are alive now. The reasoning in the argument is flawed because it

　　 overlooks the number of people in each generation during the last three thousand years who left no descendants

　　 disregards possible effects of disasters such as famines and plagues on human history

　　 overestimates the mathematical effect of repeated doublings on population size

　　 fails to take into account that people now alive have overlapping sets of ancestors

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