There are no billion-year-old main-sequence o- or b-type stars. a. true b. false

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.

What drives the atp synthase reactions that produce atp

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above