Scientists recently pulled out the oldest DNA ever found from mammoth teeth. _______ old is the DNA ?

a) 1 million years
b) 2 million years
c) 1 billion years
d) 5 million years

Scientists have just pulled DNA that’s more than 1 million years old from teeth and tusks left behind by mammoths that traversed an ice-covered Siberia. The teeth and tusks were preserved in the region’s permanently frozen ground.