What components of the cell membrane allow for the movement of some small an medium molecules? Why is energy not required in this movement? Que componentes de la membrana celular permiten el movimiento de algunas moléculas pequeñas y medianas? Por que no se requiere energía en este movimiento?

Males of different species of the fruit fly drosophila that live in the same parts of the hawaiian islands have different elaborate courtship rituals. these rituals involve fighting other males and making stylized movements that attract females. what type of reproductive isolation does this represent?