Question

scientific models always (1 point)
represent old information.
have limitations.
require memorization.
are complete.

Explanation:

A scientific model is a representation of a system, concept, or phenomenon. It is based on available data and knowledge. However, as our understanding grows or new data emerges, models may need to be revised. So, they can't be completely comprehensive (so "are complete" is wrong). They don't necessarily represent old information as they can be updated with new research (so "represent old information" is wrong). They are tools for understanding, not just for memorization (so "require memorization" is wrong). But by nature, since they are simplifications or representations based on current understanding, they always have limitations.

Answer:

have limitations.