Seven months ago, quinn witnessed the gruesome murder of a close friend. although many people expected him to suffer from this, he seemed to have the opposite reaction. he had a greater appreciation for life, his relationships with his family became more meaningful, and he became more involved in his faith. quinn's response is known as: posttraumatic stress disorder. survivor resiliency. hypervigilance. stimulus generalization.

Survivor Resiliency

Explanation:

Survivor Resilience is defined in psychology as an adaptive characteristic of an individual to cope with and recover from adversity after facing a traumatic event, and go back to life either with a continuous normality or with a more positive outlook on it.

In the case of Quinn, after witnessing the murder of a close friend, a very traumatic event, instead of falling into depression, panic, or even what it is called survivors guilt, he went the complete opposite way and placed greater value on being alive and the meaning of it, thus showing that his internal psychological strength (resiliency) was great, a traumatic event caused him to embrace life.  

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.