If the conductivity of copper were ten times less, wires would have to be ten times the cross-sectional area to provide the same conductivity.
It is very doubtful that any beings in the universe could develop a civilization remotely comparable with our own without the use of metals.
Self-evidently, the gravity on the surface of a planet limits the maximum size of large terrestrial organisms.
James Lovelock has pointed out that atmospheric levels of oxygen much above about 25 percent, let alone 30 percent, would cause raging conflagrations today.
As we have seen so far in this series, fire was an absolutely crucial component in humanity’s rise to civilization and technology.