Final answer:
Ribosomes and cell membranes are universal features found in all cells on earth, essential for protein synthesis and cellular structure.
Explanation:
Ribosomes are a universal feature found in every single cell on earth, both eukaryotic and prokaryotic. They are responsible for protein synthesis, a crucial function in all cells. Cell membranes are another universal feature present in all cells, providing structure and controlling what enters and exits the cell. All cells, regardless of type, possess these essential components.
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