It+is+apparent+that+there+is+no+death

When Millay writes that it is "apparent" that there is no death, it's not a literal perspective. The fresh smell of spring and the earth is nice and the notion of death or rotting is not present to the speaker in this time frame. Death is always around, however it is masked here by flowers and springtime. In addition to this, Millay could also mean that nothing ever dies away for good, because there is always growth of something new and beautiful.