Humans are indeed still evolving, the way how we are evolving nowadays has changed slightly compared to how we would have been evolving had we not developed cities and the modern way of life and how we live. There are always adaptations going on and different selective pressures as well.
Explanation: long-tailed helps a lizard with balance. It provides a fat reserve for the lizard in times of starvation. A lizard uses its tail to communicate its feelings and its social status. Lizards detach their tails as a defense mechanism.
A mutation is a change in DNA, the hereditary material of life. An organism's DNA affects how it looks, how it behaves, and its physiology.
