Question

in which specimen were cells first identified?
o microorganism
o cork bark
o dna
o mitochondrion

Explanation:

Robert Hooke first identified cells in 1665 while observing cork bark under a microscope. He named the small compartments he saw "cells" due to their resemblance to the small rooms (cells) in a monastery. Microorganisms were observed later by Antonie van Leeuwenhoek. DNA was discovered much later in the 20th century in terms of its structure (although nucleic acids were known earlier). Mitochondria were discovered in the 19th century.

Answer:

cork bark