Which of these correctly distinguishes mitosis from meiosis? a mitosis occurs in germ cells and meiosis occurs in somatic cells. b crossing over takes place in mitosis and not in meiotic cell division. c meiosis produces four 2n daughter cells; mitosis produces two 2n daughter cells. eliminate d the number of chromosomes remains the same in mitosis and is reduced by half in meiosis?

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.

Which of the following best explains the changes in biodiversity shown in the graph?

What is a radical? a group of atoms that give off radiation a group of atoms that act like one atom a group of ions that have no charge a group of ions that break up during a reaction