Answer:
The elements are used because the half lives can denote when it was trapped in the rock.
Explanation:
The half lives of different elements can help to determine when the fossil was created and without it, it would be much harder to determine the ages of fossils.
<span>Europeans began trading slaves with Africans during the fifteenth century.</span>
Answer:
True
Explanation:
The role of visual observers (VOs) is to alert the rest of the crew about potential hazards during SUAS operations.
