What was the Cenozoic era

Aspectroscope breaks light up into its colors, allowing scientists to analyze light from the solar system and universe. by studying the spectral line patterns, widths, strengths and positions, scientists can determine the speed, position, and of celestial bodies. a) age b) origin c) rotation d) temperature

What is a analogy for transition metals

What would be the net charge of 1 gram gold piece after removal of 1% of its electrons