A scientist studies a model of a widely accepted theory about the universe. The model would most likely а
understand a theory which cannot be observed
B
prove that the theory would not change in the future
C demonstrate how the theory can be changed into a law
D
prove that all other theories about the universe are incorrect

A

Explanation:

It's A since a theory is a widely accepted explanation of something in the natural world which can be tested but not 100% proven.

neutrons are in the middle of the atom and the electrons, which are much smaller.

mechanics (greek   is that area of science concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effects of the bodies on their environment. the scientific discipline has its origins in ancient greece with the writings of aristotle and archimedes[1][2][3] (see history of classical mechanics and timeline of classical mechanics). during the early modern period, scientists such as galileo, kepler, and newton laid the foundation for what is now known as classical mechanics. it is a branch of classical physics that deals with particles that are either at rest or are moving with velocities significantly less than the speed of light. it can also be defined as a branch of science which deals with the motion of and forces on objects. the field is yet less widely understood in terms of quantum theory.

explanation: