Identify the vessels corresponding to the letters a-d on the graph above

Use the drop-down menu to complete the statement. an electron in the first energy level of the electron cloud has an electron in the third energy level.a. a lower energy thanb. a higher energy thanc. the same energy as

Which feature of a human community is similar to a niche in a biological community

Creating new things to solve problems and improve life depends on the close interaction of which two fields?