Which is a way that paleontologists have contributed to humans' understanding of the history of life? They found evidence that climate has not changed significantly.
They grouped organisms by the period in which they existed.
They discovered that the first humans lived with dinosaurs.
They learned that life has existed since Earth was created.

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?