Answer: I don't know if this is right but I think it is
b. at the organ level
Explanation:
Answer:
A dam that could allow fish to still pass through is a fishway/fish pass its a "fish ladder" that is structured on or around artificial or natural barriers to allow for fishes natural migration and the movement for potamodromous species.
Answer:
Minimizes repulsion between the valence electrons
Explanation:
The electrons repel each other, so the lowest energy state is one in which the electrons are as far from each other as possible.