Which best describes how a fetus exchanges gases while in the womb? Gases are removed by the umbilical cord and taken to the uterus.
Gas exchange occurs at the lungs.
Gas exchange occurs through the placenta.
Gases diffuse out of the fetus directly into the uterus.

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

A. burning woodcombustion is the process of burning something. make brainliest if correct

Idont really know sorry

Answer(28.02g/mol);