The best explanation for how humans populated the earth is a. they migrated from asia to other continents over the last two million years. b. they migrated mostly over land from africa over the last eighty thousand years. c. they developed varied human species in different places over millions of years. d. they traveled by boat from africa to other continents over the last forty thousand years.

:) during the cold war, people were afraid of communists, both outside and inside the united states. the red scare and mccarthyism that grew out of these fears were damaging to the american way of life. during the mccarthy years, many of the freedoms guaranteed in the bill of rights were limited. write a paragraph explaining what lessons can be learned from the mccarthy era about what u.s. citizens need to protect in order to preserve the democratic political system and the american way of life.

Choose the option that best completes this statement: the british and the continental system were blockades that prevented the united states from trading with without extreme risk to ships, goods, and sailors.

Describe two observations that galileo was the first to make with his telescope.