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1. Sweat glands, salivary glands and gastric glands are the examples of -
 
2. Injecting a tadpole with thyroxine would lead to -
 
3. A very high level of calcium in the blood suggests malfunction of the -
Answer variants:
parathyroid
precocious metamorphosis
thymus
Endocrine glands
atrophy of gonads
Exocrine glands