The terms used (high-spin and low-spin)
doesn’t refer to a number of unpaired electrons but to different electron configuration
in d-orbitals that you can get from the pairing energy. As for Fe3+’s unpaired
electron here are the answers:
Octahedral high-spin: 5 unpaired
electrons
Octahedral low-spin: 1 unpaired
electron
There's a lot of capillaries in the lungs because the blood needs to be transferred and the capillaries are the smallest vessels that can do this.
Pressure caused by high temperatures are balanced by gravity
I believe the answer would be 1500m/min