Vital body systems begin to lose function as you age. aging effects all of the body's cells, tissues, and organs which in turn affect the functioning of all body systems. among other changes caused by cell aging, there is an increase in pigments and
a. fatty substances called lipids inside the cell
b. fatty substances called proteins inside the cell
c. fatty substances called amino acids inside the cell
d. fatty substances called carbohydrates inside the cell

Which of the following is not considered an appendage of the skin? nails glands follicles none of the above

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.

Why are some places regularly warmer or cooler than others in a given month