most specific is b. genus
both names start w ulva, so they are b. closely related species
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!
Answer:
The Milky Way is a spiral galaxy. - B)
Cytokinesis occurs during mitosis; it's where the cell divides during the final stage
