Most poisonous alkaloid is extracted from tobacco leaf and widely used as an insecticide

Nicotine

Explanation:

Tobacco smoke contains numerous toxic chemicals including organic carcinogens such as polycyclic aromatic hydrocarbons and aromatic amines, inorganic carcinogens such as polonium 210, and arsenic and toxic alkaloids such as nicotine. Nicotine extracted from tobacco has also been used as an insecticide.

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a researcher conducts an experiment on the secretion of a particular hormone in mice. scientists inject mice with a substance that stimulates the production of the hormone. the scientists then test the levels of hormones produced by the mice. the tool used to measure the hormones consistently detects the levels at 10 points lower than the actual hormone levels in the mice. this tool makes measurements, but the measurements aren't .

explanation:

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