| Key |
| Primary |
| Elementary |
| Underlying |
| Rudimentary |
| Fundamental |
| __ metabolism |
| At the bottom |
| For beginners |
| Type of reader |
| Metabolism type |
| Metabolism start |
| Tot's ___ reader |
| Like some readers |
| __ metabolic rate |
| ___ cell carcinoma |
| Kind of metabolism |
| Type of metabolism |
| ___ metabolism rate |
| Of primary importance |
| Metabolism descriptor |
| Forming a bottom layer |
| Adjective for a primer |
| Type of metabolic rate |
| Kind of cell in biology |
| Kind of reader for tots |
| Underlying, as metabolism |
| __ reader: grade school text |
| ___ reader (elementary school book) |