1 Select the true statement about the cycling of matter through Earth's ecosystems.
OA. Cycling of matter began around 1976.
OB. Only animals can cause matter to cycle through an ecosystem.
OC. Matter can only move from plant to plant in an ecosystem.
OD. Cycling of matter occurs every day

When svante arrhenius first proposed his acid-base theory, he was a doctoral candidate. his professors thought his ideas were unfounded. within a decade, the arrhenius theory of acid-base was widely accepted and praised within the scientific world. arrhenius defined acids as compounds having ionizable hydrogen and bases as compounds with ionizable a) barium. b) hydronium. c) hydroxide. d) oxygen.

Which of these expressions are correct variations of the combined gas law? p1v1t2 = p2v2t1 both

How many moles of lead are in 1.50 x 10^12 atoms of lead? could you explain the answer as well and not just give it to me i am refreshing for finals and i need to know how to do it