Mycoplasmas, the smallest cells, are only (i) `mu` m in length while bacteria could be (ii) `mu` m. Among multicellular organisms, human red blood cells are about (iii) `mu` m in diameter. Identify (i), (ii), and (iii).

Options

A. `|{:("(i)","(ii)","(iii)"),(0.5,5-7,7):}|`
B. `|{:("(i)","(ii)","(iii)"),(0.3,3-7,9):}|`
C. `|{:("(i)","(ii)","(iii)"),(0.3,3-5,4):}|`
D. `|{:("(i)","(ii)","(iii)"),(0.3,3-5,7):}|`

Answer

To solve the question, we need to identify the sizes of mycoplasmas, bacteria, and human red blood cells based on the information provided.

### Step-by-Step Solution:

1. **Identify the size of Mycoplasmas (i)**:
- Mycoplasmas are known to be the smallest cells. Their size is approximately **0.3 micrometers** in length.
- Therefore, for (i), we fill in **0.3**.

2. **Identify the size of Bacteria (ii)**:
- Bacteria are larger than mycoplasmas. The typical size range for bacteria is about **3 to 5 micrometers** in length.
- Thus, for (ii), we fill in **3 to 5**.

3. **Identify the size of Human Red Blood Cells (iii)**:
- Human red blood cells (RBCs) are larger than both mycoplasmas and bacteria. The average diameter of human RBCs is about **7 micrometers**.
- Hence, for (iii), we fill in **7**.

### Final Answers:
- (i) = 0.3
- (ii) = 3 to 5
- (iii) = 7

### Summary of the filled blanks:
- Mycoplasmas are only **0.3** micrometers in length.
- Bacteria could be **3 to 5** micrometers.
- Human red blood cells are about **7** micrometers in diameter.