How do we know that oxygen was present in the Archean time period?

What is a compass? how does it work

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.

If the basis of an isosceles trapezoid have lengths of 11 and 26, what is the length of the median?