Organize the following groups of elements in order from least to most electronegative (Chromium, Zinc, Tungsten, lodine ) piz help me

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Adrought killed all the plants in an agricultural farmland. gradually, due to wind and some birds for. nearby areas, new plants started sprouting l. what stage of succession was taking place in the farmland? a) competition b) nudation c) ecesis d) reaction e) migration

Identify two examples of chemical reactions that you have encountered during the last week. identify an exothermic and endothermic reaction. explain.