what natural resource is used as the main power source in the earliest machines and what problems can you see in this resource? [pbs mill times] please help this is due in 4 mins

Josh is teaching michael how to be an effective speaker. what two general hints for effective informative speaking should josh share?

"people are the greatest resource that a country has". justify.

Which characteristics are true of the arabian desert? choose all answers that are correct.has land mostly below sea levelcovers almost the entire arabian peninsulacontains the largest sand sea in the worldhas very few people living there