Match the time frame listed on the left with the characteristic listed on the
right
Mesozoic era
?
Age of the dinosaurs
Paleozoic era
?
Most of Earth a desert
End of the
Mesozoic era
?
A layer of iridium
deposited all over Earth

biology is the study of life. it is the study of living organism.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.

oxygen +1 most likely

the answer is c.

by: nicholas dooley