Why are cancerous tumors harmful?
They can change from malignant to benign.
They can never be removed from the body.
They turn existing healthy tissue into cancerous cells.
They invade and destroy the surrounding healthy tissues.
My answer is C
C is not true exactly, unless you define tissue as a region. Cancer cells spread into healthy tissue, start to replicate, tumors compete with normal tissue for nutrients, can crowd out normal tissues. That is not exactly turning existing tissue into cancerous cells, but it has almost that meaning.
So I think C is the best answer.
On answer D, "destroy" is not correct, unless competing for nutrients can be considered "destroying".
I am not keen on either C or D, because both are sloppy with meaning. A and B are wrong.
Your answer of option C is correct. Cancerous tumors are harmful because they turn existing healthy tissue into cancerous cells. This happens when mutations or changes occur in our DNA, which lead to uncontrolled cell growth and division. Unlike healthy cells, cancer cells do not perform their normal functions and can invade and destroy surrounding tissues. This can lead to organ damage and can potentially be life-threatening if left untreated.
To arrive at the correct answer, it was necessary to understand the characteristics of cancerous tumors. These tumors can indeed change from malignant (cancerous) to benign (non-cancerous) under certain circumstances, but this doesn't diminish their harmful nature while malignant. Additionally, some cancerous tumors can be removed from the body through surgery or other treatments, so the statement that they can never be removed is incorrect.
Understanding the consequences of cancerous tumors requires knowledge of the biology and pathology of cancer. It is important to continuously learn about these topics to comprehend the nature and implications of cancer.