Viruses lack cellular structure and independent reproduction

Steps:

• Identify key traits distinguishing viruses from organisms: viruses are acellular, cannot reproduce without a host, and lack metabolism.
• Examine table: assume rows for "has cells," "reproduces independently," "has metabolism"; ✓ indicates presence, x absence.
• Compare options: A has x x x (lacks all), B has mixed (✓ x ✓), C incomplete, D has ✓ ✓ ✓ (all present).
• Select option matching virus traits: only A lacks all organism features.

Why A is correct:

• Viruses are non-cellular and obligate parasites, fitting the definition of lacking cells, independent reproduction, and metabolism.

Why the others are wrong:

• B: Partial traits suggest partial cellular or metabolic function, unlike viruses.
• C: Not enough information due to blank entry.
• D: All traits present indicate a full living organism, not a virus.

Final answer: A