Select all that apply. What contributed to Kepler's discovery that the Earth's orbit was actually an ellipse?
determining the laws of planetary motion
telescopes and persistent inquiry
universal gravitation
math data proved his theory
the microscope

it takes on an electronical energy

you didnt put any of the following

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.