Carbohydrates are sugars, and as monomer units can be assembled into polymers called polysaccharides, such as cellulose, the rigid chemical of most plant cell walls.Nitrogenous bases are organic molecules in which the amine group of nitrogen, combined with two hydrogen atoms, plays an important part.It is therefore clear that von Dniken has had an impact on archaeology, but, equally, since first airing the question whether or not we have alien ancestors, the answer has remained a negative: there is, four decades later, no hard evidence ET landed on Earth.
Nucleic acid monomers are made from a carbohydrate monosaccharide, a nitrogenous base and one or more high energy phosphate groups.
Yet supermarkets sell a lot of chilled meals that include rice and these can have "use by" dates up to a week away.
What is different about the cooked rice in these meals?
Life on Earth depends on liquid water and the temperature at which it freezes or boils.
How much would the values of 0°C and 100°C need to change to make life here unsustainable, or hugely different?
In recent years batteries have changed out of all recognition. Today the cells are components in battery systems, incorporating electronics and software, power management and control systems, monitoring and protection circuits, communications interfaces and thermal management. Mesopotamia, incorporating Sumer, Babylonia and Assyria, known in the West as the Cradle of Civilisation was located between the Tigris and Euphrates rivers (The name means "land between the rivers") in the so called Fertile Crescent stretching from the current Gulf of Iran up to modern day Turkey. the Sumerians of ancient Mesopotamia developed the World's first written language.