From in vitro experiments, the substance will change when it receives a higher temperature only.Therefore concluded that 1 + 2 + 3 + 4 is when fronts occur verb receives the higher temperature only.
The experimental compounds in vitro which two will change when the temperature was higher only conclude that. 1 + 2 + 3 + 4 will react when the temperature was higher only.
From the experiments of in vitro second will change when get higher temperatures.It can be concluded that the 1+2+3+4"s reaction when they receive higher temperatures.