Answer:
The signal transduction pathway has at least one step in which the signal is transmitted by the activation of a protein via phosphorylation.
Explanation:
The answer is C. RNA, but it should really by called mRNA for Messenger RNA
The tremendous heat given off by the nuclear fusion process causes the gas to glow creating a protostar. This is the first step in the evolution of a star. The glowing protostar continues to accumulate mass.
hope this helps ^^
