. When might you have been able to see a human (Homo sapien) hunt down a wooly mammoth, or have to defend him/herself from a saber toothed cat? Write it as: Era to Period to Epoch

Which of the following statements best characterizes changes to agriculture in the united states since 1900? a. increased mechanization has reduced the need for labor.b. increased mechanization has increased the need for water, thereby increasing the need for labor.increased mechanization has increased the use of land, thereby increasing the need for labor.d. increased mechanization has increased food production, thereby increasing the need for labor. select the best answer from the choices provided.