The Precambrian Era is the very first part of the Earth's history. Its name refers to this era preceding the one that came after it - the Cambrian.
The Precambrian Era began 4.6 billion years ago and ended 541 million years ago, thus encompassing 90% of the planet's history.
Since it happened long ago, there isn't that much evidence of that big period of time. Bacteria fossils that are more than 3 billion years old were found. More complex organisms like algae appeared during Proterozoic eon (the latest part of the Precambrian era).
Nitrogen has a number of important uses. It can be used to replace air and eliminate oxidation of materials. Its most important use is in creating ammonia, which in turn is used to make fertilizer and explosives. Liquid nitrogen is used as a refrigerant for very low temperatures
Because Yuki started off with a bowl of ice right. She sat in the room and watched the ice melt, the ice melts when the temperature is to hot then she heats up the water on a burner and it vaporizes when the water gets to hot.
Lamproptera meges, the green dragontail, is a species of swallowtail butterfly (family Papilionidae) found in parts of South Asia and Southeast Asia. There are ten subspecies. A specimen from Java is the type species of the genus.