How did walter Lincoln hawkins change the world today. How did he make the world a better place to live

Walter Lincoln Hawkins invented polymer which made everyone's life easy and better.

Explanation:

Walter Lincoln Hawkins was an engineer and an African American chemist. His curiosity to know how things worked lead him to develop many new techniques of reusing and recycling plastics. It was in the year 1956 when he invented polymer along with the help of his partner Victor Lanza. And this invention changed the life of people, making people's life better.

Polymer is a substance made out of plastic which contains chemical addictive made up of carbon antioxidants. This protects the material from worsening and at the same time it also helps in preventing it from severe weather conditions. Even today, polymer is still in use and it is also cost effective.

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this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.