Simple, prokaryotic organisms have been on earth for over 3 billion years and have been able to grow and evolve into many different and successful prokaryotic organisms. which structure evolved in cells approximately one billion years ago that allowed for the forming of more complex, multicellular organisms?

a) nucleus

b) ribosome

c) plasma membrane

d) golgi apparatus

The correct answer is option A: the nucleus, a fundamental part of the eukaryotic cell.

Explanation:

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First we will analyze what each of the structures is.

A) nucleus: main structure of a eukaryotic cell. The nucleus contains the DNA inside.

B) Ribosome: they play a fundamental role in protein synthesis.

C) plasma membrane: it is the membrane that surrounds the cell. It is semipermeable, it means that it lets in some substances that are good for the cell and does not let harmful substances pass.

D) Golgi apparatus: helps the synthesis of lipids.

After the analysis, we conclude that the correct answer is option A: the nucleus, a fundamental part of the eukaryotic cell.