the minimum acceleration in physical growth that would indicate adolescence might differ
according to species
the fossil record, though steadily expanding, will always remain incomplete
detecting the adolescent growth spurt requires measurements on the same individual at differ- ent ages
complete skeletons of extinct hominids are extremely rare
human beings might be the first species to bene- fit from the survival advantages, if any, conferred by adolescence
11. Fossils of the coral Acrocora palmata that date from the last period when glaciers grew and consequently spread from the polar regions are found at ocean depths far greater than those at which A. palmata can now survive. Therefore, although the fossilized A. palmata appears indistinguishable from A. palmata now living, it must have differed in important respects to have been able to live in deep water. The argument depends on the assumption that
no fossils of the coral A. palmata have been found that date from periods when glaciers were not spreading from the polar regions
geological disturbances since the last period during which glaciers spread have caused no major downward shift in the location of A. palmata fossils
A. palmata now live in shallow waters in most of the same geographical regions as those in which deep-lying A. palmata fossils have been found
【新GRE逻辑阅读10套:第三套】相关文章:
最新
2016-03-01
2016-03-01
2016-03-01
2016-03-01
2016-03-01
2016-03-01