How many continents are on earth​

(1) which phrase describes an important agricultural change that occurred during the mississippian period? (a) first cultivation of wild grains (b) expansion of marsh elder farming (c) spread of corn agriculture (d) gathering of nuts and berries (2) which group of native americans use northwestern arkansas as it’s traditional hunting grounds? (a) osage (b) quapaw (c) woodland (d) caddo

Acontinental polar air mass foms in

Fossils of glossopteris, an extinct fern, were discovered on which continents to support the theory of continental drift? check all that apply.