What was the importance of griffith's work with strains of the bacterium streptococcus pneumoniae

 experiment discovering the "transforming principle" in pneumococcus bacteria. Griffith used two strains of pneumococcus (Streptococcus pneumonia) bacteria which infect mice – a type III-S (smooth) which was virulent, and a type II-R (rough) strain which was nonvirulent.

c) Sun, Earth Moon

Explanation:

The lunar eclipse is the natural process that occurs at certain time intervals, where the moon is covered by the shadow caused by the earth. In other words, in a lunar eclipse, the earth is between the moon and the sun, preventing the sun's rays from reaching the moon and imposing a shading that causes the moon to darken.

In this case, we can say that the geometry of the lunar eclipse is: sun - earth - moon.