The answer is 'cooler'. The Cretaceous Period was relatively warm and was experiencing global warming. However, a cooling trend was evident towards the end of the Cretaceous. The Paleocene followed the meteorite impact that resulted in the extinction of most of the dinosaurs. It is thought that dust particles in the atmosphere resulted in cooling during the early Paleocene.
The answer that best represents the above characteristics would be <u>A.) Down syndrome </u>
Answer A) Magnesium
The atomic number of magnesium is 12. The atomic mass of magnesium is 24.31 amu. The total number of electrons is 12. The symbol for the element is Mg.
Answer B) Calcium
The atomic number of magnesium is 20. The atomic mass of Calcium is 40.078 amu. The total number of electrons is 20. The symbol for the element is Ca.
Answer C) Nitrogen
The atomic number of nitrogen is 7. The atomic mass of nitrogen is 14.0067 u. The total number of electrons is 7. The symbol for the element is N.
Answer D) Carbon
The atomic number of carbon is 6. The atomic mass of carbon is 2.0107 u. The total number of electrons is 6. The symbol for the element is C.
Answer E) Mercury
The atomic number of mercury is 80. The atomic mass of nitrogen is 200.59 u. The total number of electrons is 80. The symbol of the element is Hg.
Answer F) Gallium
The atomic number of Gallium is 31. The atomic mass of Gallium is 69.723 u. The total number of electrons is 31. The symbol of the element is Ga.
