yes.
all of which have been recycled
It is where life began on Earth. It is the majority substance in life on Earth.
Photosynthesis by early cyanobacteria began producing oxygen more than 2 billion years ago, leading to the Great Oxidation Event. This influx of oxygen fundamentally changed Earth's atmosphere and allowed for the evolution of aerobic organisms.
Living things have always existed on Earth since life began billions of years ago. Various scientists and researchers throughout history have contributed to our understanding of living things through observations, experiments, and discoveries. Notable figures include Antoine van Leeuwenhoek, Charles Darwin, Gregor Mendel, and Louis Pasteur.
Joe
People began living in Australia about 50,000 years ago.
to farm
Before the colonization period began, the people living in England were protestants. They were members of the Church of England.
In high elevation, mountainous areas, the air is very thin, meaning the oxygen molecules are more spread out. When people began living in these mountains, breathing was obviously an issue, since there was less oxygen to breathe. These people's bodies have adapted over the years, and they generally require less oxygen. Their body produces more red blood cells to carry oxygen as well.
Oxygen is chemically released through photosynthesis in green plants. The atoms of oxygen, however, were created in the cores of stars that exploded long before our Solar System began to form
This is a false presumption. The life that exists on Earth now is dependent on oxygen, but it was not always so. Life on Earth emerged long before there was any noteworthy amount of oxygen. In fact oxygen was highly toxic to the first organisms. Oxygen began to build up in the atmosphere when cyanobacteria began carrying out photosynthesis, which uses sunlight to convert water and carbon dioxide into sugar and oxygen.
9,000,000
the earth