Agroup of scientists examined a meteorite from mars and found a carbon-rich substance that is produced when microorganisms decay. they concluded that the meteorite provided evidence there was once life on mars. why is this an emerging idea? check all that apply.
it is unlikely that there was life on mars.
other scientists disagree about the origin of the carbon-rich substance.
the scientists only studied one meteorite.
there is a scientific consensus that life exists on other planets.

Has regulatory areas for thirst, hunger, body temperature, water balance, and blood pressure

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.

What are the three different shapes or structures shapes or structure of carbon-based molecules?