Mating fiddler crabs use several types of sexual selection. males battle each other for territory using their greatly enlarged claws. the territories preferred by females are those in the most physiologically stressful area, and only healthy males can maintain them for long. the males also raise their claws to signal femailes; those that reach the greatest heights are most noticeable becasue females are attuned to look upwards for predators. which model of sexual selection is least likely to impact this mating system.
a. good genes mechanism
b. direct benefits
c. sensory bias
d. male - male competition
e. all of these models apply to the scenario equally well

How does science influence the decisions made about social, economic, and political issues?

Archeologists have discovered three sites showing conclusive evidence for the mastery of fire in tanzania, from a period slightly after the time that homo habilis was present in africa. these sites clearly were founded by homo erectus, the descendent species of homo habilis that migrated north, out of africa and into asia. homo erectus was known to have mastered fire, from ample evidence at sites in asia. there is no reason to attribute mastery of fire to homo ergaster, the descendent species of homo habilis that remained in africa. which of the following is an assumption on which the argument depends? (a) before their migration, homo erectus occupied african territory as far south as tanzania.(b) the strain of migration provided the selective pressure motivating homo erectus‘ mastery of fire.(c) homo ergaster would not have derived as much benefit from the mastery of fire as did homo erectus.(d) homo ergaster inherited all cultural knowledge from homo habilis, a species that did not have mastery of fire.(e) homo ergaster did not occupy regions as far south as tanzania until well after the time of these three sites.

Scientific evidence is most likely to be consistent if it is based on data from