How many significant figures are in the quantity 400 m ? a.4 b.3 c.1 d.2

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)

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?

The similarities of organisms in which two areas numbered above provide the best evidence for common ancestry between organisms in both locations?