Will mark brainliest
Two masses exerting a force on each other is an example of .

Which phrase best completes the sentence?

Kepler's law

heliocentric theory

universal law of gravitation

geocentric theory

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

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.

answermeridional ;

the answer is symmetrical : )