Answer:
“We have a brain for one reason and one reason only, and that's to produce adaptable and complex movements,” stated Wolpert, Director of the Computational and Biological Learning Lab at the University of Cambridge. ... The evidence for this is in how well we've learned to mimic our movements using computers and robots.
In the blank should go of friction.
I only know what number 1. is and its Mechanical Energy.
One double bond consists 4 electrons, so 2 double bonds means 8 electrons
