What is an example of positive phototropism

plain growing towards the light

Explanation:

Phototropism is a biological reaction in plants to react based on the source of the light energy they receive.  It's especially observable on plants growing inside a building, with light coming from limited direction, for example your flower pot sitting on the window sill.

A positive phototropism will have the plant/flower growing towards the source of the light.  Over time, the stem of the plant will curve to maximize the light input coming from that limited angle source.

you did not attach the discourse, but i assume it to be the discourse on the origin and basis of inequality among men (the original titile in french is: "discours sur l'origine et les fondements de l'inégalité parmi les hommes"), also know as "second discourse". in this discourse, jean-jacques rousseau emphasizes that private property is the basis of all inequalities.

therefore, what enabled the old regime to maintain as long as it did was private property.

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.