Which of these are common theories that explain how the First Americans came to North and South America? Check all that are true.

They traveled across the ocean on boats.

They built a land bridge.

They rode across the ocean on large animals.

They migrated across Beringia.

I'm pretty sure they migrated across Beringia with a land bridge... Let me know if I am wrong!

Explanation:

B and D

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explanation:

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many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation: