In the Section "Investigating Life: Did a Myosin Gene Mutation

question 33

Multiple Choice

In the section "Investigating Life: Did a Myosin Gene Mutation Make Humans Brainier?",the temporalis and masseter muscles close the jaw while the platysma opens the jaw.To clench your teeth,which of the following must occur?

• A)Contract the temporalis and masseter and relax the platysmA.
• B)Relax the temporalis and masseter and contract the platysma.
• C)Contract the temporalis,masseter,and platysma.
• D)Relax the temporalis,masseter,and platysma.
• E)Contract the temporalis and relax the platysma and masseter.

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