Photo attached

For chemistry

This drawing shows a human body system. what is the primary function of this body system?

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

If it is an isoelectronic series select true, if not select false. o2-, s2-, se2-, te2- na+, k+, rb+, cs+ n3-, p3-, as3-, sb3- ag, cd+, sn3+, sb4+ f-, cl-, br-, i- f-, ne, na+, mg2+ s2-, s, s6+