How
is gravity measured

Gravity is measured by acceleration that it gives to freely falling objects . At Earth's surface the acceleration of gravity is about 9.8 meters ( 32 feet) per second per second. Thus, for every second an object is in free fall, its speed increases by about 9.8 meters per second.

Explanation: blueyedmtngirl from my understanding from astrophysics,there is no unit to measure gravity but its presence can be known.

blueyedmtngirl if I have not answered you to your satisfaction please comment below.

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion

trachea, alveoli, lung capillaries, arteries