HELP SOS If the half-life of a radioactive substance is 950 million years and you have 96
atoms of it, how many half-lives will have passed by the time that 6 atoms of
the substance remain?
A. 5
B. 2
C. 6
D. 4

Which of these would most likely be a stimulus that would cause the body to initiate feedback mechanisms a.) normal body temperature in an arctic environment b.) normal boy temperature in a tropical environment c.)light physical activity d.)low blood sugar