Lyuba is a female woolly mammoth calf who died years ago at the age of 30 to 35 days. Lyuba is believed to have suffocated by inhaling mud while bogged down in deep mud in the bed of a river her herd was crossing. Lyuba appears to have been healthy
The only known Cambrian Arthropods are the Crustacea, and of these much the most abundant group is that of the Trilobita, which are altogether confined to the Palaeozoic rocks, and are by far the most.
Rock Layers: Timeline of Life on EarthEvolution is a complicated subject. While everybody understands that black bears are related to grizzly bears and we can even figure they are related to extinct bears, lots of people wonder how scientists can be so su