Who was the 30 prestident of the united states giving brainliest

John Calvin Coolidge Jr. was the 30th US president

Calvin Coolidge

Calvin Coolidge was born in Plymouth Notch, Vermont, on July 4, 1872. Coolidge rose through the ranks of Massachusetts government as a Progressive Republican. Elected U.S. vice president in 1920, he became president following the death of Warren G. Harding in 1923.

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i discarded the supernatant and kept the pellet in this part of the experiment because you have to return all unused chemicals into their original containers at the end of each labratory.

explanation:

seeing as no choices were provided, i'll do my best to answer it from knowledge.

job specialization promotes work ethic to the person doing the job. he/she may be strong in the arms and able to lift things, specializing him/her in a job where you lift and carry.