Oxides of iron only came on the scene well after there were trace fossils of organisms that we can reasonable assume did not use oxygen fueled metabolisms.
They provide evidence for animals that existed before and do not now. It shows proof of the different evolution. It also gives us comparisons of organisms we have today and where they possibly came from.
Yes. There are organisms called anaerobic bacteria which do not need oxygen. To some organisms, called obligate anaerobes, oxygen is actually toxic. The first living things on Earth were obligate anaerobes.
Earth is a single sphere, though not quite perfectly round in shape. Therefore, I assume that the 'spheres overlap' in the question is more about tectonic plates - which indeed overlap at their edges. If I'm wrong, then the question needs more information.
I think so... Pennies are made out of copper with some zinc (?) on the inside. Since copper is a metal I would assume that we have a limited amount of it here on Earth. Although, I highly doubt we are going to run out of it any time soon!
20.9 % (almost 21%)Half a billion years ago the percentage was higher (in the mid-30s) due to abundant plant life. Before photosynthesis evolved, atmospheric oxygen was close to zero & poisonous to the earliest cells.it is 21% oxygen,that is ok because it isn't good to breathe pure oxygen
Triton's gravity is about 8% of Earth's. So it is reasonable to assume that he would weigh about 12lbs.
Anaerobic came first, because there was no oxygen in the Earth's original atmosphere.
spongesThey were prokaryotic and anaerobic organisms developed first due to the early environmental condition on earth.
Nobody really knows when the earliest organisms were on Earth. It was definitely more than a million years ago.
Not all diamonds include nitrogen, which gives the stone a yellow cast. Nitrogen makes up 78% of earth's atmosphere, and it is reasonable to assume that nitrogen is also available deep within the earth's mantle where diamonds are formed.
ATP has been used as long as there have been living things on Earth. It developed with the earliest anaerobic prokaryotic cellular life. Probably slightly more than 3 billion years, not long after the crust of the Earth first began to solidify and liquid water became available.
why do pieces of earths earliest crust not exist today
there was no oxygen in Earth's early atmosphere.
Adam and Eve
There is no particular reason to assume that Earth will collapse.