Choose all the answers that apply. Erosion can be reduced by .

contour plowing
putting up fences
cutting down trees
removing topsoil

Which of the following is a testable hypothesis? a. if i brush my teeth, i will get fewer cavities than if i don't brush my teeth. b. green toothpaste tastes better than blue toothpaste or red toothpaste. c. smart, careful, healthy people always brush their teeth. d. it's wrong to not brush your teeth before you have an important conversation with someone.

What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?

Explain why scientists use shared characteristics to make cladograms.