Answer:
An atom
Explanation:
An atom is defined as the smallest, indivisible unit of a substance.
Elements are defined as the simplest part of a substance that can no longer be broken down in a reaction.
<em>Elemental phosphorus is a substance and when a piece is subdivided until it becomes physically impossible to divide further, then it becomes an atom of phosphorus.</em>
The correct answer is atom.

A solar eclipse occurs when the Moon is between the Earth and the Sun.
The Moon casts a shadow over the Earth, fully or partially blocking out sunlight.
Because of how the Moon is positioned at these times, solar eclipses only occur during the new moon phase. However, not every new moon comes with a solar eclipse.
Presidential Reconstruction
In the spring of 1865, the Civil War came to an end, leaving over 620,000 dead and a devastating path of destruction throughout the south. The North now faced the task of reconstructing the ravaged and indignant Confederate states. There were many important questions that needed to be answered as the nation faced the challenges of peace:
<span>Who would direct the process of Reconstruction? The South itself, Congress, or the President?Should the Confederate leaders be tried for treason?How would the south, both physically and economically devastated, be rebuilt? And at whose expense?How would the south be readmitted and reintegrated into the Union?<span>What should be done with over four million freed slaves? Were they to be given land, social equality, education, and voting rights?</span></span>