LADDER:
A piece of equipment consisting of a series of bars or steps between two upright lengths of wood, metal, or rope, used for climbing up or down something.
A series of ascending stages by which someone or something may progress.
A vertical strip of unravelled fabric in tights or stockings.
For example:
‘You need a tall step ladder to change a light bulb.’
‘employees on their way up the career ladder’
‘one of Sally's stockings developed a ladder’
https://en.oxforddictionaries.com/definition/ladderAs for your question:
https://www.google.ca/search?q="animal evolution" ladder&tbm...As for the question itself:
https://www.rona.ca/en/tools/ladders-stools-and-scaffoldingAlors, vraiment, je ne suis pas sûre de vous suivre... Pour moi, il est assez évident que le segment dit "en conséquence de l’utilisation de l’échelle en question" (de l’échelle dont il est ici question, de l’échelle susmentionnée, etc.) - the subject matter of the release.