The half-life of cobalt 60 is 5.3 years. what fraction of a sample remains after 21.2 years?
a.
one half
b.
one quarter
c.
one eighth
d.
one sixteenth

All organisms contribute some water to the water cycle by conducting

Northern switzerland has a fairly cold climate caused by sea winds from the atlantic ocean but souther switzerland tends to be much warmer and sunnier, what could cause this difference?

Body temperature is tightly regulated in mammals for example when external temperatures drop too much the body of a mammal response by in order to it's core temperature.