What would happen if there were no H+ ion concentration difference when the
channel opened?

Consider the last statement in the prompt: "people take such environmental factors into account in their choices when deciding where to live." do all people have a choice as to where they live? what factor plays a key role in this decision and may therefore play a large role in determining quality of life?

Chloroplasts and bacteria are in size. a. similar b. at different ends of the size range c. exactly the same d. none of these

Fungi exist as single cells or as branching networks of multicellular filaments. how does the structure of filaments relate to their function