Kamora's Black History month Crossword puzzle

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Across
  1. 2. An American bacteriologist and microbiologist, who, in 1933, became the first African-American woman to be awarded a Ph.D. in a natural science.
  2. 3. An American educator and marine biologist specializing in corals.
  3. 4. An American engineer, physician, and former NASA astronaut.
Down
  1. 1. An American chemist who developed the "Ball Method",
  2. 3. An American biochemist. She was the first African-American to receive a Ph.D. from Columbia University and the first African-American woman in the United States to earn a Ph.D. in chemistry.