Question

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fill in the blank question
the arrow points to an ancestral cell type often referred to as the ancestor.
bacteria
archaea
eukarya

Explanation:

In the field of biology, the common ancestor of Bacteria, Archaea, and Eukarya is known as the last universal common ancestor (LUCA). It is the most recent population of organisms from which all organisms now living on Earth have a common descent.

Answer:

last universal common