Pls help me ill make u a brainliest if its correct Sandra measured her heart rate and her breathing rate at rest and again after doing 50 jumping jacks. What is the main reason that both her heart rate and her breathing rate went up with exercise?
Answers
1.They both increased to carry heat away from her working muscles more efficiently.
2.They both sped up to supply her working muscles with enough oxygen to remain in homeostasis.
3.Her muscles were out of shape and required extra blood and oxygen to maintain her jumping pace.
4.Her lungs and heart ran short on oxygen while she was exercising and sped up to maintain homeostasis.

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.