What is the heterocyclic amine in histamine?

this is the chemical that causes itching. An organic compound in whic nitrogen atoms of amine groups are part of either an aromatic or a nonaromatic ring system.Most common heterocyclic organic compound.

evaluate the extent to which the seven years' war (french and indian war, 1754–1763) marked a turning point in american relations with great britain, analyzing what changed and what stayed the same from the period before the war to the period after it.

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.