En que se diferencia la Edad Media del siglo de las luces, por favor lo necesito urgente ​

Which objects allow humans to access groundwater? check all that apply.

Suggest two reasons why irrigation is important for human development of the desert

[ou.01jthe greatest speed with which any physical object moves is 300,000 km/soundsec. which of the following has a speed of 300,000 km/sec? a.light in water b.light in vacuum c.sound in air. d. sound in water