In what regions of the world can avian influenza be found today? Who is most at risk of getting it?

Apart of the periodic table is shown. a portion of the sixteenth and seventeenth columns of the periodic table is shown. column 16 reads eight oxygen, 16 sulfur, and 34 selenium. column 17 reads nine flourine, 17 chlorine, and 35 bromine. which of the following elements is less reactive than the others? bromine (br) oxygen (o) selenium (se) sulfur (s)

Describe how a student should adjust the microscope to see the cells on a slide more clearly?

In each transformation of energy , some energy what?