Which cell is the precursor to eukaryotic in evolution of the cell

The first organisms to inhabit Earth were prokaryotes that lived 3.5 billion years ago. prokaryotes are well organised, achieving all of an organism’s life functions within a single cell. These were the precursors to eukaryotic cells

the answer is "a.) well–developed vascular system."

explanation:

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?