Why can
one haemoglobin molecule
transport maximum four oxygen molecules?​

c

explanation:

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.

well, you see. the answer to your question is quite simple. the thing that is big, powerful, and over 9,000 is your mom.

answer; both surfaces of the membrane are nonpermeable