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B
Salivary glands
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C
Thoracic glands
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D
Mouth
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Solution
The correct option is A Abdominal glands A. Abdominal glands
EXPLANATION: A spider has seven silk-producing glands in the abdomen. These abdomen glands secrete proteins. These proteins extruded through spinnerets to produce different kinds of silk and spider uses this silk to build webs to catch their prey.