Combine the number of its Protons and Neutrons and you will have its atomic mass.
The answer is D because they would have to make quarries just below the surface to mine
Mineral ores much quicker (Quarries- a large hole/pit under ground used to get stone and minerals)
This is false because males have 1 X and 1 Y chromosome. It's females who have 2 X chromosomes. So, it's false.