Question

In Evolution, How is the brain size affected/ intelligence by the natural selection ? explain how ecology has an impact as well.

Answer 1

Solution

• Evolution of human intelligence is closely related with increase in brain size and cranial capasity with evolution of language.
• Intelligence is natural fittnes indicator which was evolved due to need of humans to survive and reproduce to keep existance on earth.
• So for need of survive and reproduce for future generation leads to increase in strategies for natural selection so brain size get increased for that.
• human intelligence was able to evolve to significant levels because of the combination of increasing domination over habitat and increasing importance of social interactions.
• As a result, the primary selective pressure for increasing human intelligence shifted from learning to master the natural world to competition for dominance among members or groups of its own species.
• Intelligence increases oxygen demand of brain as well as nutrients. So brain cortex get increased in size.