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madreJ [45]
3 years ago
14

How many chemicals in cigarettes are known or suspected to cause cancer?

Biology
1 answer:
sineoko [7]3 years ago
5 0
<span>More than 50</span>. There are more than 7000 chemicals in cigarette smoke, 250 of which are known to be detrimental to health and 69 chemicals are carcinogenic (can cause cancer).  Some of the carcinogenic chemicals in cigarette smoke are: Arsenic, Cadmium, Chromium, Formaldehyde and Nickel.
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What are the three main ways that common ancestry may be shown through homologies
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Homology is a study of similar characters found in two species because of common ancestry.

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3.Molecular homology: Species show molecular similarities such as DNA,RNA and protein

An example of homology is seen in the skeletal strycture of vertebrates. That is arm of a human,leg of a cat,fin of a whale and wing of a bat.

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3 years ago
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JulijaS [17]

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