Suppose you are an archaeologist trying to answer this question: When did the first people migrate to North America? Why might the answer to this question change over time? What do you think? Check all of the boxes that apply.

The first people migrated to America at the end of the last ice age because sea levels decreased from the massive glaciers providing a temporary bridge (Bering Land Bridge) connecting the old world and the new world. Scientists and Anthropologists predict this event occurred after 12,600 BP approximately 20,000 years ago

Explanation:

Over time this answer could change as newer technology and innovations are seen yearly.

answer:    

a.

explanation:

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.