Which statements accurately describe binary star systems? check all that apply.

Which of the following best describes brazil's economy from 1650-1880? a. it gradually shifted to manufacturing as the industrial revolution progressed. b. it was based on mining. c. it was based on plantation agriculture, where slaves served as a labor force. d. it was based on small, family-owned farms.

Sink holes may eventually for to join a. wide valleys b. zone of aeration c. dripstones d. aquifer

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