Based on the above quotes, how do we know that on the oregon trail

The color contrast between the open ocean and the lagoon between the spit and the mainland. the greater concentration of suspended sediments in the lagoon gives the waters a more turbid appearance. the source of sediment in the lagoon is (are) [(rivers and streams from the mainland) (wind-borne sediment from the spit) (ocean waves washing over the spit) (all of these contribute)].

If you have a green turn signal light, you must before making your turn. a. check the crosswalk b. yield to cross traffic and check the crosswalk c. turn off your car's turn signal d. none of the above

When did human beings first arrive in the americas? how did they get there?