How did Leland Melvin change the face of science

Leland is the only person drafted into the National Football League to have flown in space. The Pro Football Hall of Fame honored his athletic and academic accomplishments by placing his Detroit Lions jersey under glass in Canton, Ohio. Through these professional experiences working on high stakes teams he developed a deep and nuanced understanding of effective team dynamics.

Leland has a Bachelor of Science degree in chemistry and a Master’s degree in materials science engineering. He worked at NASA Langley Research Center in the area of nondestructive testing creating optical fiber sensors for measuring damage in aerospace vehicles, resulting in publications in numerous scientific journals. After hanging up his space boots he was appointed head of NASA Education and served as the co-chair on the White House’s Federal Coordination in Science, Technology, Engineering, and Mathematics (S.T.E.M.) Education Task Force developing the nation’s 5-year STEM education plan. Leland was the United States representative and chair of the International Space Education Board (ISEB), a global collaboration on learning about space. He uses his life story as an athlete, astronaut, scientist, engineer, photographer, and musician to help inspire the next generation of explorers to pursue Science, Technology, Engineering, Art, and Mathematics (S.T.E.A.M.) careers.

Explanation:

b) a state law could be declared illegal if it contradicted the constitution.

explanation:

the conflict of this case originated when james w. mcculloch, a cashier of the baltimore branch of the second bank of the united states that the congress had chartered in 1816, refused to pay a tax imposed by the maryland state.

in the case, the state of maryland appealed that the establishment of a second bank was unconstitutional since the constitution didn't say anything about granting that power to congress. however, the case determined that even if such right wasn't specifically stated in the constitution, it was part of the "implied powers" of the government enunciated in article i, section 8.

the case also eliminated maryland's legislation to impose taxes to a national bank, asserting that even though the states retained the power of taxation, the constitution's laws are supreme and can not be controlled by the states, therefore, if a state law contradicts the constitution, it should be declared illegal.

explanation:

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation: