vertebrates
According to the theories of Charles Darwin complex forms of life evolved over long periods of time from simpler forms.
gymnosperms
When the ozone layer is formed, the life forms evolved. They were not possible earlier.
Less complex life forms.
to exchange energy and mass through controlled biochemical timebound forms and structures.
It is now thought that, although green plants probably evolved from the green algae and animals from some other early forms, most modern protists have followed independent evolutionary lines. So, ******No****** they have evolved individually!
If by 'aliens' you mean intelligent extra-terrestrial beings, there is no plausible evidence that any have ever visited Earth. However, with billions of planets in the universe, it would be arrogant of us to believe that we are alone, as the only intelligent life forms that ever evolved. There must be 'aliens' out there.
charles darwin
Scientists think that the first life forms appeared on Earth about 3.6 billion years ago. These were simple cells that eventually evolved into the abundance of life we see today.
as of right now no one knows if there are other life forms in space until then the answer is NO
They evolved from the most basic life forms slowly (sharks were around with the dinosaurs) until reaching their current stage.
Most evolutionist believe that the first people ever known to us today were Adam and Eve. They think that they evolved from monkeys (not sure what kind). But if your religious (like most people (especially Christian)) you believe that god created all life forms especially humans.