Which structures are being measured by these units?
- A$10^{-3}\ \text{m}$: chloroplast; $10^{-6}\ \text{m}$: ribosome; $10^{-9}\ \text{m}$: nucleus
- B$10^{-3}\ \text{m}$: nucleus; $10^{-6}\ \text{m}$: chloroplast; $10^{-9}\ \text{m}$: xylem vessel
- C$10^{-3}\ \text{m}$: ribosome; $10^{-6}\ \text{m}$: xylem vessel; $10^{-9}\ \text{m}$: chloroplast
- D$10^{-3}\ \text{m}$: xylem vessel; $10^{-6}\ \text{m}$: nucleus; $10^{-9}\ \text{m}$: ribosome