b.) powers that allow the each branch to curb the others
Boats and railroads were improved with the use of steam power.
I think A but I don’t know if I’m right
One of tycho brahe's major contributions to astronomy was to prove that A comet was outside of Earths atmosphere.
One of tycho brahe's major contributions to astronomy was to prove that A Supernova was much farther away than the planets.
These are his two contributions