Which choice is a biotic factor of an ecosystem? A. sun

B. ants

C. air

D. soil

Often on a topographic map, every fifth contour line is darkened. what is this line called? a. key b.slope c.benchmark d. index contour

4. propanol and isopropanol are isomers. this means that they have a) the same molecular formula but different chemical properties. b) different molecular formulas but the same chemical properties. c) the same molecular formula and the same chemical properties. d) the same molecular formula but represent different states of the compound

How many moles of oxygens atoms are present in 5.00 mol of diphosphorus of fe2(so4)3