The results of an investigation are usually more reliable if A.
it is done outside.
B.
it is done only once.
C.
it is done using a ruler.
D.
it is done more than once.

It is done more than once. D

A test will be reliable when it gives the same repeated result under the same conditions.

D. it is done more than once

Explanation:

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A. volume stays constant. just took took the quiz

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