Answer:
C) X = 100 % ; Y = 0 %
Explanation:
At the time the rock originally formed, you had only the parent isotope X and the daughter isotope Y had not yet had time to form.
You had 100 % X and 0 % Y.
<span> the Pacific ring
of fire is the border of the Pacific oceanic plate. It is called the
ring of fire because that edge is very active and lots of subduction
occurs there causing earthquakes and volcanic eruptions</span>
Answer: D. Exposure to neurotoxin, which affect the endocrine system
