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: The answer is C
Explanation: C and G pair with each other and T pairs with A and A pairs with U
Explanation:
<em><u>Members of the kingdom Euglenozoa do have mitochondria, but are a diverse group in terms of structure. All euglenoids have a flagellum, whereas the kinetoplastids have a kinetoplast</u></em>

Well I think is physics right? Like bones
Answer:
Due to the density, it should sink further down.
Explanation: