1.

Give scientific reasons:During human evolution the hands became available for use.

Answer»
  • During human evolution, the climate of earth started becoming dry.
  • This resulted in loss of forest cover.
  • The apes which were arboreal on the trees thus descended and started walking on land.
  • The lumbar bones underwent change and the apes started walking upright on the grasslands.
  • The vertebral column also underwent change. Due to upright posture the forelimbs were freed from locomotion.
  • The legs started bearing the weight of the body and the hands became available for use.


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