Question

models need to be changed when ______.
a. they are based on experimental data
b. scientific understanding changes
c. they represent a phenomenon
d. they are designed to answer a question

please select the best answer from the choices provided

○ a
○ b
○ c
○ d

Explanation:

Scientific models are revised when new knowledge or understanding (from research, discoveries) changes. Option a: Models based on experimental data are valid, not a reason to change. Option c: Representing a phenomenon is a model's role, not a change trigger. Option d: Design to answer a question is initial purpose, not a change reason. Only b fits as scientific understanding evolution requires model updates.

Answer:

B. scientific understanding changes