Zoology is the branch in which all these aspects been studied.
One fourth means (one half) of (one half) .
So the 18 months must be two half-lifes.
The half-life of this particular isotope is 9 months.
What is ATP? why is it an important product of cellular respiration? ATP is stored energy. ATP is an important part because it is the energy that living things that cant go through photosynthesis have to ingest in order to recieve energy