Explanation:

- The initial requirements and the process of struggle for existence push humans to find new ways to solve their basic problems.

- This leads to the development of new tools, techniques, or ideas—called Primary Innovations.

- These are original inventions or solutions created to meet basic needs such as food, shelter, and safety.

- Expansion refers to the spreading of people, ideas, or practices, not their initial creation.

- Culturisation is the process of adopting or adapting cultural elements, not direct invention.

- Secondary Innovation is when existing inventions are modified or improved, not created anew.

Correct Answer:

Option:1, Primary Innovation