Mosses,ferns and thallophytes
The answer is 2) 12 '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
O2 (oxygen) is a covalent compound
TTG ATG ACG
Swap every Adenine (A) for a Thymine (T), every Uracil (U) for an Adenine, every Cytosine (C) for a Guanine (G), and every Guanine (G) for a Cytosine (C).