Simplify the following text for a Grade 7 native English-speaking person.
Original: In the text this branching tree idea is tentatively applied to the history of life on earth : `` there may be branching '' .
Simplified: In the text this branching tree idea is tentatively applied to the history of life on earth : `` there may be branching '' ( p. 191 ) , but the branching diagram is not displayed again specifically for this purpose .