Which element is a part of cytochrome

Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.

D H_ R V _ _ M _V D _ _ R V

Select the combination of letters that when sequentially placed in the blanks of the given letter series will complete the series.

Select the combination of letters that when placed sequentially in the blanks of the given letter series will complete the series.

Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.

B _ _ E N _ Y U _ N _ Y _ _ N

Select the set of letters that when sequentially placed in the blanks of the given letter series will complete the series.

_ s t _ r _ t u r s _ _ r _ _ u

Select the combination of letters that when placed sequentially in the blanks of the given series will complete the series.

Select the number combination of letters that when placed sequentially in the blanks of the given series will complete the series.

Select the option that represents the letters that, when placed from left to right in the following blanks, will complete the letter series.

Find the next two term in the given series.

P, M, R, N, T, O, ?, ?

Select the combination of letters that when sequentially placed in the blanks of the given letter series will complete the series.