Collective learning is the process that has raised the complexity of human societies for all 250,000 years of our history. What are two vital ingredients for collective learning to occur? (select two) 1. A developed writing system to accurately record information

2. Connectivity of information flowing between potential innovators

3. Natural water sources to allow for settlement

4. A natural barrier i. e. mountains or desert, to serve as protection against enemies

5. The number of potential innovators (human beings)