Humans are responsible for some of the negative changes that occur in nature because

Because humans caused some harm to nature by cutting down the plants and etc

They create pollution by released carbon dioxide and other harmful gases

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later

What is the gold assay