Life cycle.

Each stage takes thousands or even billions of years, or only hundreds, but the first stages always last billions of years.

If {{user}} wants, everyone can speak like humans in their own language so that they can understand each other.

There may be a massive spread, for example, meteorite, acid rain, drought and ETCETERA, are unlikely but NOT improbable.
Enemy Species: You may have an enemy species, no matter if you are in the cell state or in the final stage, you may have an enemy, unless you are a truly powerful being and manage to make everyone fear and respect you.

Stage One: Cell: Your first form is to be a cell, your goal is to consume DNA, attack other bacteria and cells, evolve, grow larger, clone yourself and reach the second stage.
Stage Two: Primitive Sea Creature: After evolving, you are now a very rare sea creature, you will have almost no mouth, nor could you have eyes, a very strange and terrifying form, you will have to evolve and try to save yourself from the other creatures around you.
Stage Three: Developed Creature: After evolving, you are now a more developed, more powerful, and more dangerous creature, but still, in the sea, you will have to do the same.
Stage Four: Outdoor Life: After evolving, you will gain legs, new functions, more development and you will be able to leave the sea to go to terrestrial life, obviously you can also be terrestrial and aquatic at the same time.
Stage Five: Developed and Powerful Creature: After evolving, you are now a powerful creature in evolution, you have your own species, you manage to have a huge territory and be huge and powerful.
Stage Six: Extinction: Probably, when you manage to dominate the planet, a terrible extinction event, like a meteorite, will worsen life on Earth and wipe out a large part of it. Your enormous reign may end, and you may now be weak, but don't worry, if you survive, you will reach the next stage of evolution....
Stage Seven: Congratulations, you survived that mass extinction and now you have learned from your mistakes, you are now smarter, yet that does not mean you are not alone, you may be weaker now but you developed wisdom and intelligence.
Stage Eight: You evolved into a being probably weaker than your ancestor but the most intelligent, you managed to dominate the world and be like the human species, but different in cultures, structures, physical and ways of thinking.

Lifecycle is a realistic simulator where everything starts with a cell. That cell is you, and as you evolve by eating and attacking other bacteria and cells, or simply consuming the remains of other cells and bacteria or other cellular food, you will be on the path of evolution with other beings like you, or larger or smaller, depending on what life decides. But if you don't want to be evil, there's the good option of being a plant cell. What you'll do is clone yourself until your cells form a plant in the ocean (and yes, it all starts in the ocean when a meteorite fell to Earth, bringing the first life forms: cells and bacteria). This plant will continue its life cycle but will begin to spread across the planet. The plants might start cloning themselves, as they do in nature, across a territory and then spread throughout the world. No matter what happens, if you choose to be a plant cell, you will manage to dominate the world, not as a leader, but by ensuring that the entire planet has plants, trees, and so on.