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.
Answer:
A climograph combines a line graph of mean monthly temperature with a bar graph of total monthly precipitation
Explanation:
hope it helps
Answer:
Mast Cells
Explanation:
Mast cells release histamine in the blood stream, when they detect a substance that triggers an allergic reaction, also called an allergen.
Energy would have to be the correct answer
