Adam and Eve :)
SOMETHING haha i got you hehehahahoho
The oldest forms of life are found in the kingdoms Archaea and Bacteria. These are both prokaryotic organisms that have been on Earth for billions of years. They are known for their resilience and adaptability to extreme environments.
Domain Bacteria contain the oldest known fossils of cells in bacterial cells.
The fossils of the oldest life forms can be found in the Precambrian period of the fossil record.
It is so because, the oldest fossils are obtained from the life forms which used to exist at that time in the oldest ages. At that time there was no so much changes in the world, the life forms being simpler. As the age of the earth advanced hence the forms of life also adapted or tried to adapt to the changes of the surrounding. The climate changed and so did the life forms. It was determined that in the older times, 1st life forms came in the water bodies and then from there the land forms developed. So as we see the later life forms are more complicated, thus the oldest fossils are more simpler compared to their most recent counterparts.
The oldest known life form on earth (that still exists today) is a stromatolite found in western Austrlia, it is 3.8 billion years old.
Single celled organisms like a bacteria and are some of Earth's oldest life forms.
They live, metabolizing food and reproducing (some in your gut). They are just the oldest known of single celled life-forms. Their cells lack a nucleus, i.e. their DNA floats in the cytoplasm of their cells.
The oldest known organisms are bacteria, specifically ancient forms of archaea and bacteria. These single-celled microorganisms have been found in fossils dating back billions of years, making them some of the earliest life forms on Earth. Archaea and bacteria are two distinct domains of life, with archaea often inhabiting extreme environments and having unique biochemical characteristics compared to bacteria.
That depend on your religion. Some religions believe that people were. But if you go for evolution, then its single celled organisms.
Currently, Earth is the only planet where carbon-based life forms are known to exist. However, the search for life, including carbon-based life forms, continues on other planets and moons within our solar system and beyond.
The Cenozoic is known as the Age of Mammals.