Concept:
Cancer cells have the ability to invade surrounding tissues and spread to distant parts of the body.
• Malignant tumors are cancerous and can spread.
• This spread occurs via blood or lymphatic system.
• Formation of secondary tumors at distant sites is a defining feature.
Step 1: Understand the given situation.
The question describes movement of cancer cells from one organ to another.
Step 2: Identify the biological term.
This process is called metastasis.
Step 3: Analyze options.
• (A) Metastasis: Correct
• (B) Parthenogenesis: Reproduction without fertilization
• (C) Interkinesis: Stage between meiosis I and II
• (D) Metamorphosis: Developmental change in organisms
Step 4: Conclusion.
Thus, spreading of malignant tumor cells is called metastasis.
Final Answer: Option (A)