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Green algae is the oldest ancestor of all land dwelling (non-marine) plants.
We evolved about 500 million years ago from fish that evolved to anphibians then mammals then we evolved to primates
The last common ancestor between Homo sapiens and their closest relatives among other apes (Chimpanzees) occurred around 6 to 8 million years ago. Because this field is such a new one, and because the information is so limited, as of yet it is difficult to assign a specific species to the common ancestor. Right now the closest we have come is Sahelanthropus tchadensis.
They would be second cousins, once removed. The descent is from a common ancestor. Thus 1st cousins share a grandparent as a common ancestor. 2nd cousins share a great-grandparent as an ancestor. If the descent from the common ancestor is not an equal number of generations, the inequality is expressed as 'removed' from the oldest generation being compared.
Boston Common is in Boston, Massachusetts.
Senet, an ancestor of backgammon is the oldest game in the world. It was played in Ancient Egypt around 3500BC.
The Boston Common Park is located in Boston, Massachusetts. It is listed as the oldest park in the country. It is a location that runners pass by when running the Boston marathon.
Evolutionists determine that two organisms have a common ancestor is by looking at fossil evidence in different rock layers using the law of Superposition (Oldest layers are on the bottom, newest are on the top) and compare the skulls or other bones to each other in order of oldest to newest (or newest to oldest). Another way to determine this is to examine the amount of DNA a certain species shares with another species. An example of this would be that Humans share roughly 90% of our DNA with chimpanzees or the other Great Apes.
Christianity and Islam both have roots in Judaism. Abraham's son Issac was the ancestor of Jesus. Abraham's son Ishmael was the ancestor of Muhammad.
The oboe's first ancestor, called a shawm, originated in the 12th century.
One of the oldest known frogs is called Triadobatrachus.