What Order of Events Would Show How Natural Selection Occurred

question 28

Multiple Choice

What order of events would show how natural selection occurred in a population of lice that could originally be controlled by the chemical permethrin?

• A) A louse population evolves resistance to permethrin; permethrin is used to kill lice; lice become more common in schoolchildren.
• B) Some lice are resistant to permethrin; permethrin is used to kill lice; lice resistant to permethrin become the most common type.
• C) Permethrin resistance is common in lice; permethrin is used to kill lice; most lice become sensitive to permethrin.
• D) Permethrin is used to kill lice; individual lice change in order to survive exposure to permethrin; most lice become resistant to permethrin.

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