Mr. Ray created a secret ingredient for a breath mint that he thinks will "cure" the bad breath sea
organisms get from eating kelp patties. He asked 100
customers with a history of bad breath to try his new breath mint. He had fifty customers (Group
A) eat a breath mint after they finished eating a kelp patty. The other fifty (Group B), also,
received a breath mint after they finished the sandwich, however, it was just a regular breath
mint and did not have the secret ingredient. Both groups were told that they were getting the
breath mint that would cure their bad breath. Two hours after eating the kelp patties, thirty
customers in Group A and ten customers in Group B reported having better breath than they
normally had after eating kelp patties.
a. Which people are in the control group?
b. What is the independent variable?
C. What is the dependent variable?
d. What should Mr. Ray's conclusion be?
e. Why do you think 10 people in group B reported fresher breath?

What arrow on the map points to an air mass moving toward a cold front

Solutions to environmental problems in europe must

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.