Answer:
when people have improved in their life, is called development.
The declaration of independence said that everyone has the right to life liberty and the pursuit of happiness
These laws were a cause of the bus boycott because the poor treatment, segregation and violence from them were the motivation for Rosa Parks to not move from her seat on 1st December 1955 and the motivation for the black population to boycott the buses in support of her.
I believe the answer is: cancer
According to research, about 60% of people who developed cancer got in when they hit the age of 60 or above.
The destruction of cells that happen in older people's body happen on a much higher rate compared to younger people but the regeneration is much slower. This plays a role in speeding up the growth of cancer.