The Geologic Time Scale is divided into huge blocks of time called eras. Eras are defined by major changes in the fossils found in the rock layers that were formed during those time spans.

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.

What causes heat transfer in fluids

What is the main source of phosphorus?