Question

the first cells on earth are believed to have been ________, meaning they lacked a nucleus.
eukaryotic
prokaryotic
multicellular
autotrophic

Explanation:

Prokaryotic cells lack a nucleus. Eukaryotic cells have a nucleus. Multicellular refers to organisms made of multiple cells and autotrophic refers to organisms that can produce their own food. The first cells on Earth are thought to be prokaryotic.

Answer:

B. Prokaryotic