Gymnosperms is an advance ground than pteridophytes ? justify​

Which of these statements best describes the st. lawrence seaway? the st. lawrence seaway connects the st. lawrence river with the arctic ocean. the st. lawrence seaway provides an important trading route between the u. s. and mexico. the st. lawrence seaway provides an important trading route for the u. s, but has little value for canada. the st. lawrence seaway connects the great lakes, the st. lawrence river, and the atlantic ocean.

Which plains area lies in both the united states and canada? altiplano central canadian shield coastal plains great plains

Someone me with this: a mineral' is determined by its actomic structure.