True or False? The Plessy v. Ferguson Supreme court case further enforced the separation of black and white Americans

Explanation:

It is correct yes

c. taught scientists many new things about the earth, but not other planets.

explanation:

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.