Which reaction below represents a balanced, double replacement chemical reaction?
a) c2h5oh + 3o2 → 2co2 + 3h2o
b) rb2o + cu(c2h3o2)2 → 2rbc2h3o2 + cuo
c) 2al + 3h2so4 → 3h2 + al2(so4)3
d) 2h2o → 2h2 + o2

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5

What are the three major branches of natural science? • earth and space science, life science, physical science •earth and space science, physical science, chemistry •physical science, life science, chemistry •life science, chemistry, physics

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange