Que es y para que sirve una maquina? cuales son las maquinas simples? que es el esfuerzo? que es la fuerza de resistencia?

Which statement about spreading knowledge of diseases and health around the world is correct?

What is one property that water and oil do not share

Which of the following variables has the strongest influence on the variations found in american family life? a.race and ethnicity b.religious affiliation c.social class and culture d.education and occupation