An important effect that hunter-gatherer societies may have had on the environment was: a. soil erosion
b. extinction
c. air pollution
d. all of the above

Which must be kept in mind when determining if an explanation is correct? check all that apply.which must be kept in mind when determining if an explanation is correct? check all that apply.

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.