Choose all the answers that apply. The energy in an ecosystem:

is eventually lost as heat

is recycled and reused

is part of an open system

is transferred through the food chain

flows only one way

Tension between the british and boers was caused primarily by what things?

Based on the excerpt, what does the war powers resolution do?

Match these items. 1 . stephen douglas published "north star" 2 . frederick douglass first african slaves arrived in jamestown 3 . crittenden compromise proposed kansas-nebraska act 4 . republican party extend 36° 30' line to california 5 . abolitionists servitude in exchange for passage to the united states 6 . indentured struggle between proslavery and antislavery groups 7 . jefferson davis formed to prevent spread of slavery 8 . "bleeding kansas" wanted slavery abolished 9 . uncle tom's cabin president of confederacy 10 . 1619 harriet beecher stowe