Discover Questions

Do birds have a more complex respiratory system than amphibians?? 3080.45 is what percent of 5,353.04? How many ways can we rearrange 4 girls and 2 boys in a line if we only consider their gender? How many moles of NH3 are produced when 1.8 moles H2 reacts? I want to become a astronaut. How it is possible..? Now I'm in highschool. Please help me...?