1. Describe the following processes in healthy animals: nerve conduction, the role of myelin in nerve conduction, and the role of acetylcholine in activating muscle cells, eventually leading to contraction. Please be as detailed as possible and feel free to draw annotated pictures to illustrate the mechanisms. 2. Now, what may cause muscle weakness? Examine all the options in the pathway above that may lead to a physiological state of weakness.

18. which statement about cancer is true?

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.

Physical characteristics of down syndrome