Plants and animals that became extinct during the Precambrian Era include acritarchs and Ediacara biota. These were soft-bodied organisms. Animals such as Namacalathus and Cloudina also became extinct in the Precambrian Era.Know More
The Ediacara biota were soft-bodied creatures that resembled fronds, discs or tubes. Scientists are not quite sure if they were plants or animals. They might have been types of fungi or microbes that formed colonies. At the time, there were no flowering plants.
The Ediacara biota flourished until the very end of the Precambrian Era, a time which is known as the Ediacaran period. This was over half a billion years ago. What fascinates scientists about these creatures is that they formed fossils in the first place, even though they had soft bodies.
Some acritarchs are fossils of the tiny cysts that dinoflagellates and algae reverted to when their environment dried up. Scientist can use these cysts to determine what the environment was like when these microscopic plants were alive.
Cloudina was one of the first animals that built a shell around itself, and great colonies of these animals helped to build up ancient reefs. Like modern bivalves and univalves, its shells were made of calcium carbonate. Namacalathus, a creature resembling a perforated cup on a stick, was also believed to have a calcified skeleton.Learn more about Prehistory
As of 2015, scientists believe the first animal on Earth was the comb jelly of the phylum Ctenophora. It is an ocean-dwelling, gelatinous organism whose length varies from less than half an inch to 16 inches. Until 2008, sponges of the phylum Porifera were considered the first animal.Full Answer >
The earliest tools of cavemen, dating back millions of years, were made of bone, stone and wood. The handaxe was the first major tool developed by early humans, consisting simply of a sharpened stone held in the hand and used to chop and pierce.Full Answer >
The Great Wall of China was built during several periods of China's history, most famously during the reign of Qin Shi Huangdi, the first Emperor of China. He ruled between 221 and 206 B.C.Full Answer >
The term Stone Age refers to the prehistoric period before the advent of metal-working, when most tools were fashioned from rocks and stones. According to the Oxford Dictionary, the Stone Age lasted about 2.5 million years.Full Answer >