Tran made the timeline below to show the order in which great scientific theories were developed. theory of gravity à cell theory à ? À theory of continental drift Which theory belongs in place of the question mark in Tran's timeline? Aristotle's atomic theory Newton's laws of motion Copernicus's heliocentric theory Darwin's theory of natural selection

The correct option is;

Darwin's theory of natural selection

Explanation:

(A) The theory of gravity was introduced Sir Isaac Newton in the published work of Philosophiae Naturalis Principia Mathematica which consisted of three books on the 5th of July 1687

(B) In 1839, and 1858,  Theodor Schwann and Rudolf Virchow, respectively proposed the cell theory which consisted three parts viz

1) Cells are the building blocks of organisms

2) The cell is the fundamental life unit

3) Cells come from other preexisting cells

The first two parts was proposed by Theodor Schwann in 1839, while the third part was proposed by Rudolf Virchow, in 1858

(C) In 1859, Charles Darwin proposed the theory of natural selection in his book the "On the Origin of Species" which is the process by which an organism change so as to survive ad reproduce in its environment

(D) In 1912, Alfred Wegener, proposed the theory of continental drift.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

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explanation:

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