Answer:
the one the already have clicked
The correct answer here is "cell membrane". Generally it makes sure that nothing enters or leaves the cell, except by its highly guarded "gates", such as ion channels, that let some particles through - but they're very picky about whom to let in!
(A) a change in a developmental gene or in its regulation that altered that spatial organization
For more population and it is also bad if the world is overpopulated.
