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Based on the skeletons’ proximity, the study concluded that the two shapes represent different genders, rather than different species, of . Examining a group of five stegosaur skeletons found together in one Montana quarry, a Princeton researcher determined that Stegosaurus plates are either wide and short or tall and narrow.The larger frills and horns probably belonged to males, used either for display or in fights for a fetching lady plate function have long pointed in this direction.Based on the lack of grooves for blood vessels, previous research concluded that the plates were probably not used to cool off.Modern male animals typically use more energy for decoration—look at peacocks— and the wide plates have greater area and presumably took more energy to grow than the taller plates.
Cartoon: an editorial cartoon of Grover Cleveland encountering his illegitimate child Source: " data-medium-file="https://daily.jstor.org/wp-content/uploads/2016/10/grover_cleveland_cartoon_1050x700-300x200.jpg" data-large-file="https://daily.jstor.org/wp-content/uploads/2016/10/grover_cleveland_cartoon_1050x700-1024x683.jpg" /Once again, a political process has been derailed by sordid tales of sexual misconduct.
A James Mac Donald received a BS in Environmental Biology from Columbia and a Ph D in Ecology and Evolution from Rutgers University, spending 4 years in Central America collecting data on fish in mangrove forests.
Birth of Venus – Sandro Botticelli [Public domain], via Wikimedia Commons " data-medium-file="https://daily.jstor.org/wp-content/uploads/2015/10/Birth Venus_1050x700-300x200.jpg" data-large-file="https://daily.jstor.org/wp-content/uploads/2015/10/Birth Venus_1050x700-1024x683.jpg" /In response to declining population trends that could hurt its economy, Denmark has launched an ad campaign to encourage young couples to have more sex.
For example, researchers have long noted differences in the size and shape of the frills and horns of ceratopsians such as .
As in the current study, researchers examined specimens in close proximity, inferring that the differences represented different sexes.
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It’s hard to imagine this kind of thing convincing anyone to actually change their bedroom habits, but it’s obviously true that how much sex people have, and with whom, has economic consequences.