Double-membraned organelles shared between plant and animal cells

Steps:

• List double-membraned structures in plant cells: nucleus, mitochondria, chloroplasts.
• Determine presence in animal cells: nucleus and mitochondria are present; chloroplasts are absent.
• Exclude plant-specific structures like chloroplasts.
• Count shared structures: two (nucleus and mitochondria).

Why B is correct:

• Nucleus and mitochondria are the only double-membraned organelles defined as universal in eukaryotic cells, including both plant and animal types.

Why the others are wrong:

• A: Misses the second shared organelle (mitochondria).
• C: Includes plant-exclusive chloroplasts.
• D: Exceeds actual shared organelles; no additional double-membraned structures exist in both.

Final answer: B