Based on the information above, how can you explain why the distribution of traits changed in this population?

a. a primary source combines several different accounts of an event. b. a primary source generally benefits from having been written after an event.

explanation:

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explanation:

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.