Find the average atomic mass of copper if 7 atoms out of 10 are copper-63 (70\%) and 3 atoms out of 10 are copper-65 (30\%)?​

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.

What is the best describtion of the side of the moon that faces earth?

Which part of the healthcare system could best explain how a pharmaceutical drug works