That is the question I have for the evolution experts. I am under impression that evolution stipulates that there is a single source of all the life and it is not possible for the giants to exist.
Shawn001, can you let us know if this statement is true?
The theory of evolution isn't really about how life started in the first place on earth. Its how life evolved over billions of years to what it is today. That is a done deal, but other details about it are still being researched.
"there is a single source of all the life"
which is another field of study called "
Abiogenesis"
Abiogenesis (
pronounced /ˌeɪbaɪ.ɵˈdʒɛnɨsɪs/ AY-by-oh-JEN-ə-siss) or biopoiesis is the study of how biological life could arise from inorganic
matter through natural processes. In particular, the term usually refers to the processes by which
life on Earth may have arisen.
Abiogenesis - Wikipedia, the free encyclopedia
One of the earliest fossils on earth are cynobacteria that evolved photosynthesis which created the oxygen atmophere we have today.
Cosmology although not directly part of Evolution or Abiogenesis supports them with nucleosynthesis, which is where the heavy elements come from in early super nova star explosions which seed the universe with the elemtns like carbon. We are carbon based life forms. Carbon is created by a stars
A star's energy comes from the combining of light
elements into heavier elements in a process known as
fusion, or "nuclear burning"
For instance,
fusing carbon requires a temperature of about one billion degrees! Most of the heavy elements, from oxygen up through iron, are thought to be
produced in stars that contain at least ten times as much matter as our Sun.
NASA's Cosmicopia - Basics - Composition - Nucleosynthesis
So even our solar system and humans and all the planets are made from recycled material that came from earlier super nova explosions. We can see this process now with our different telescopes. We can measure even the elements coming from them.
Life could have come from space, from mars or from processes on earth, all of which have the ingredients for life already. We don't know however enough yet about where it came from or where it started. We do know complex life forms or any life for that matter was not possible on earth when the sun first ignited the planets were created. We also know the earth is 4.57 billion years old and some of the oldest fossil on it are 3.8 billion of signle cells, which went on for a long time, before more complex ones evolved.
As well as there have been five mass extintion events on earth and one of them the
Permian Mass
Extinction killed 95% of all life on earth and it evolved back, there was a whole other huge body of aniamls before the dinosaurs, that extition lead to the rise of the dinosaurs and the dinosaurs extintion lead to the rise of mammals and then to us.