(a) erectus was the fossil that had evolved from habilis.
| habilis | erectus |
| Its fossils were found in ** about 1.5–2 mya. | It has also been found in Europe and **. It existed about 1.5 mya. |
| Their brain was large and was about 650–800 cc. | The brain of erectus was large (about 900 cc). |
| They also shaped stones into tools and used them for chopping, pounding, cutting, etc. | The stone tools were more advanced than those by habilis. |
(b) The correct sequence from early to late geological ** is:
Silurian ** → Carboniferous ** → Jurassic **
