Sierra knows that the reproductive organs of an animal are responsible for making offspring. Which plant structure can be compared to the reproductive organs of an animal?

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

c) should be the answer.

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.