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An insect growth regulator (IGR) is a substance (chemical) that inhibits the life cycle of an insect. IGRs are typically used to control populations of harmful pests, such as cockroaches or fleas.dvantages [edit]. Many IGRs are labeled reduced risk by the Environmental Protection Agency, meaning that they target juvenile harmful insect populations while causing less detrimental effects to beneficial insects.
Best Answer: Ambergris (Ambra grisea, Ambre gris, ambergrease, or grey amber) is a solid, waxy, flammable substance of a dull gray or blackish color produced in the digestive system of sperm whales.mbergris is relatively nonreactive to acid. White crystals of a substance called ambrein, can be separated from ambergris by heating raw ambergris in alcohol then allowing the resulting solution to cool.