Nisha constantly chews on pencils and straws. according to freud, nisha

I believe the answer is: Is fixated, or stuck in the oral stage of development

During the oral stage of the develoment, we had the inherent belief that our mouth is our primary active organ. This make us have the tendency to put different types of objects into our mouth (usually happen when we are 0-2 years old) . Failing to pass this stage of development would resulted in us constantly develop the needs to  put foreign objects such as gums or pencil in our mouth.

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

explanation:

the values of the selma marchers was to bring   their ability to vote into law. mlk was not hat march, which was protesting toward lbj