Which best describes why scientists need to be creative?
They need to be sure that the evidence backs up the conclusion
They need to notice all of the evidence carefully.
They need to be constantly asking questions.
They need to think of ways to solve problems.

D, They need to think of ways to solve problems.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.