PLEASE HELP Which of the following is a testable scientific question?
Do blue M&Ms taste better than green M&Ms?
1.What is beneath the ground on planets outside our solar system?
2.How does the age of city affect the number of trees in the city?
3.How many houses are in my neighborhood?

What are the two largest greenhouse gases

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next

If a simple machine aduces the strength of a force, what must be increased? the speed of the input force the work the simple machine performs the size of the simple machine the distance over which the force is applied