Why do scientist define systems? A. it makes their experiments go faster
B. it creates a better picture of the real world
C. it minimizes sources of bias in the data
D. it makes it easier to use models

it creates a better picture of the real world

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.

d.) circle motion requires a force to give it a centripetal acceleration.