Respuesta :
The time periods from oldest to youngest:
Silurian
Triassic
Jurassic
Tertiary
Silurian
Triassic
Jurassic
Tertiary
2.08 x 10^8 = 208,000,000
4.38 x 10^8 = 438,000,000
6.64 x 10^7 = 66,400,000
2.45 x 10^8 = 245,000,000
oldest to youngest : Silurian, Triassic, Jurassic, Tertiary
4.38 x 10^8 = 438,000,000
6.64 x 10^7 = 66,400,000
2.45 x 10^8 = 245,000,000
oldest to youngest : Silurian, Triassic, Jurassic, Tertiary