What is materials and reproductive system plzz explain ...with answer​

Profesor: para la clase de historia mañana, por favor la lección sobre la guerra mundial. a. leo b. lee c. lean d. lea

What are the people in the picture doing?

Astudent requires 2.00 l of 0.100 m nh4no3 from a 1.75 m nh4no3 stock solution. what is the correct way to get thesolution? use m; v; = m.ve1o measure 114 ml of the 1.75 m solution, and dilute it to 1.00 l.measure 114 ml of the 1.75 m solution, and dilute it to 2.00 l.measure 8.75 ml of the 1.75 m solution, and dilute it to 2.00 l.o measure 8.75 ml of the 0.100 m solution, and dilute it to 2.00 l.