Answer:
Lungs
Explanation: The two organ systems that work together to provide the cells with oxygen and remove carbon dixoide from the body are the lungs.
Filtration is useful for separating sediments that are carried in water for easy drinking without the risk of disease - an example of this is a water purifier
The correct answer is ionic radii increase.
The ionic radii decrease as one move across the periodic table, that is, from left to right, while the ionic radius increases as one move from top to bottom on the periodic table. As one moves down a group in the periodic table, the supplementary layers of electrons are being added that usually results in the increase of the ionic radius as one moves down the periodic table.
