1.

Only male frogs tremble because . .

A. Female frogs do not have speech cells.
B. Female frogs have well-developed speech sacs, but the vocal cords are not located in them.
C. Male frogs have three pairs of vocal cords, so they can produce three times the sound.
D. Male frogs can magnify their sound with the help of well-developed speech sacs.
Answer» B. Female frogs have well-developed speech sacs, but the vocal cords are not located in them.


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