An experiment measures the growth of crystals in a liquid solution aboard the space shuttle. a collection of bottles has the liquid in varying strength, or concentration of the tested substance. what would be a control observation in this experiment? a. the bottle with 0% concentration b. the bottle with the weakest concentration c. the bottle with the strongest concentration d. the bottle with the medium amount of concentration

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.

In the controversial scientific process of cloning, organisms are created that are genetically identical to there parent. this process would be classified as

Which of your fossils are most likely heterotrophs? which of them are autotrophs? how do you know?