A corn plant produces both male and female flowers. The male flower forms the tassel and the female flower forms the ear on the corn. the silks that emerge from the ear are the stigma of the female flower. each silk leads to an ovule that can become a corn seed. which of these must happen for corn seeds to develop on the ear? F : more tassels than silks need to be present on the same plant
G: pollen grains must fall from tassels and land on the silks of the ear
H: pollen must be transported from the tassel to the silk through the phloem.
J: the tassels must come into direct contact with the silks of the ear

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.