identify a major event in earth's past and describe the supporting evidence for that event you would expect to observe in the fosiil record

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?

the alkaline earth metals (beryllium (be), magnesium (mg), calcium (ca), strontium (sr), barium (ba), and radium (ra)) are a group of chemical elements in the s-block of the periodic table with very similar properties: shiny. silvery-white. hopefully this ? i didn't fully understand the question