What allows a variety of birds to exist together in ecosystems

Much of the general structure and physical properties of the interior of the earth are inferred from: a)deep oil and gas bore holes b)geologic investigations c)analysis of seismic waves d) study of volcanoes

What are the spectator ions in 2h+ + so42- + ca2+ + 2r → caso4 + 2h+ + 21?

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.