Why are new scientific models developed?
a. to find out whether scientific ideas are correct
b. because original models are never accurate
c. to make the models look better
d. in order to reflect the most recent discoveries

New scientific models are developed D. in order to reflect the most recent discoveries.

In our world, change is the only constant variable. Scientic ideas developed in the past may now be considered untrue or lacking in substance. Thus, new scientific models are developed based on new information gathered from recent discoveries. These discoveries may support previous scientific ideas or produce new sets of scientific ideas.

C. gemstones they are the only non metallic mineral from the list.