Which of the following best describes a biome? a. areas of like climate and ecology b. primary productivity per square kilometer c. all of the living organisms in an ecosystem d. areas that include the entire range of an organism

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