50 one beneficial use of radioisotopes is(1) detection of disease
(2) neutralization of an acid spill
(3) decreasing the dissolved o2(g) level in seawater
(4) increasing the concentration of co2(g) in the atmosphere

The correct answer is (1) detection of disease~

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