Question

the picture shows a student using a microscope to study a prepared slide of a single - celled organism. a single - celled organism can be classified as a prokaryote based on the absence of — ribosomes chromosomes a nucleus a cell membrane

Explanation:

Prokaryotes are characterized by the absence of a membrane - bound nucleus. Ribosomes are present in both prokaryotes and eukaryotes for protein synthesis. Prokaryotes have circular chromosomes. And all cells, including prokaryotes, have a cell membrane.

Answer:

C. a nucleus