The geologic time scale is subdivided into 4 units called Eon, Era, Periods and Epochs.

photorespiration lowers the efficiency of photosynthesis by removing ribulose bisphosphate molecules.

Given 

445 of 229.79 = ? of 2398.51

$$\begin{gathered} 245 x 230 = ? x 2400 \\ 24 x 46 = ? x 2400 \\ ? = 46/100 \\ ? = 2350 \end{gathered}$$

The given number series is 3, 12, 39, 120, 364

$$\begin{gathered} 3 \\ 3 + 32 = 3 + 9 = 12 \\ 12 + 33 = 12 + 27 = 39 \\ 39 + 34 = 39 + 81 = 120 \\ 120 + 35 = 120 + 243 = 363 (Not 364) \end{gathered}$$

In the given options,

12/49 can be written as 1/(49/12) = 1/4.083

7/30 can be written as 1/(30/7) = 1/4.285

13/56 can be written as 1/(56/13) = 1/4.307

11/46 can be written as 1/(46/11) = 1/4.1818

Here in the above,

1/4.083 has the smallest denominator and so 12/49 is the largest number or fraction.