MCQ
Cell walls become brittle due to lack of ____________ elements.
- APotassium
- BCopper
- CBoron
- ✓Calcium
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| Column I | Column II | ||
| i. | Homo habilis | p. | 900 cc |
| ii. | Australopithecus | q. | 1350 cc |
| iii. | Homo erectus | r. | 650 - 800 cc |
| iv. | Homo sapiens | s. | 450-600 cc |
Select the correct option.