Compared to benign tumors, malignant tumors are different because the cells in malignant tumors are cancerous.
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Answer: The virus weakens as time passes.
Explanation: The virus will weaken continuously during transmission, and will reduce its toxicity after several generations of transmission, without causing much harm to the human body.
Corpus Callosum is a band of thick fibres which connects the hemispheres of the brain.
