Regional climate is caused by factors around the planet because around the world, if the sun is facing the part of the world you are in, it's going to be hot. Or, in Alaska for example, it is almost always cold because it's most of the time facing away from the sun.
Lead is an E (element) and can be found on the periodic table.
I believe the appropriate pair is O and S, Periodic table represents arrangements of elements ordered by their atomic number,physical and chemical properties. Both sulfur and oxygen are in the same group of the periodic table (group 6), they have a valency of 2, This means they have a greater similarity in chemical and physical properties.
Look it up on the periodic table i attached below
im too lazy to type that all out im sorry but this is one of the easiest things you'll do in chemistry and if you tried you could actually finish all 5 of these in less than a minute instead of taking like 10 min to type 10 problems out separately and making 4 diff posts