The long history of life on Earth has unfolded as a cause-and-effect relationship with the
evolving amount of oxygen (O2) in the oceans and atmosphere. Oxygen deficiency …

“The Answer to the Great Question... Of Life, the Universe and Everything... Is... Forty-two,”
said Deep Thought, with infinite majesty and calm…“I checked it very thoroughly,” said the …

Oxygen is essential for animal life, and while geochemical proxies have been instrumental
in determining the broad evolutionary history of oxygen on Earth, much of our insight into …

Abstract The “Cambrian Explosion” is known for rapid increases in the morphological
disparity and taxonomic diversity of metazoans. It has been widely proposed that this …

To improve estimates of the extent of ocean oxygenation during the late Ediacaran Period,
we measured the U and Mo isotope compositions of euxinic (anoxic and sulfidic) organic …

Organic carbon buried in marine sediment serves as a net sink for atmospheric carbon
dioxide and a source of oxygen,. The rate of organic carbon burial through geologic history …

The earliest evolution of the animals remains a taxing biological problem, as all extant
clades are highly derived and the fossil record is not usually considered to be helpful. The …

The role of oxygen as a driver for early animal evolution is widely debated. During the
Cambrian explosion, episodic radiations of major animal phyla occurred coincident with …

Over geological timescales, CO 2 levels are determined by the operation of the long term
carbon cycle, and it is generally thought that changes in atmospheric CO 2 concentration …

The emergence and diversification of early animals is commonly thought to have coincided
with atmosphere and ocean oxygenation across the terminal Neoproterozoic and early …