When conducting scientific research, appropriate methods must be used to find information that is reliable and valid. angela was assigned a research project about human body systems for her anatomy course. she would like to focus on the immune system, and more specifically, the effects of hiv on the immune system. which of the following options would be the best way for her to conduct an online search about her topic? a. type in “human body systems” + hiv b. type in “immune system” + human c. type in “hiv immune system” d. type in “human immune system” + hiv effects

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.