All of the following are true about hacksaws except: a. A hacksaw only cuts on the forward stroke. b. A coarse hacksaw blade (one with fewer teeth) is better for cutting thick steel than a fine blade. c. A fine hacksaw blade (one with many teeth) is better for cutting sheet metal. d. A hacksaw blade is hardened in the center, so it is best to saw only with the center portion of the blade.

Which of the following is not a way in which trees benefit the environment? a. they remove a significant amount of carbon dioxide from the atmosphere. b. they remove a significant amount of oxygen from the atmosphere. c. their roots hold soil in place, reducing rates of erosion. d. they remove ozone and particulates from the atmosphere. select the best answer from the choices provided a b c d