What disease is spread through warm climates ?

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

11. phosphorus-32 is radioactive and has a half life of 14 days. how much of a 124 mg sample of phosphorus-32 is present after 56 days? a) 7.75 mg b) 15.5 mg c) 31.0 mg d) 62.0 mg

Classify this reaction: 2al+n2-> aln.