What kinds of animals lived during Permian era

Which statement best explains the relationship between an area is geography and the temperature of its surface water

What is the most common reason for matter changing its state?

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+