two spur gears have same module the pitch circle diameter of the first ear is twice that for the second year if the number of teeth in the first gear is 18 what is the number of teeth in the second gear

Which two nations are doing the most to combat their environmental issues?

Select the star life cycle that is accurate

Select an environmental issue faced by the countries of this region ( central america, south america, and the caribbean) . write a 150-word essay describing the problems presented by each issue and possible solutions to these problems.