What is the main focus of carl sandburg's biography of lincoln in the selection from a lincoln preface? . a. lincoln's childhood. b. the presidential election of 1860. c. the assassination of lincoln in 1865. d. lincoln's many-sided personality

Select the correct answer. after months of heavy rains, a farmer noticed a steady drop in crop production. upon testing the farmland, it was found the soil was severely lacking nutrients. which of the following explains the loss of nutrients from the soil? a. drought b. drainage basin c. leaching d. water shedding