The key distinction between malignant and benign tumors is that ...

[corkyiscool3328]

The key distinction between malignant and benign tumors is that
 
  a. malignant tumors mostly appear within structures that are adjacent to large blood vessels.
  b. a benign tumor is encapsulated by a distinct border.
  c. benign tumors are invariably larger than malignant tumors.
  d. malignant tumors arise from neurons rather than glia.
  e. benign tumors induce apoptosis but malignant tumors do not.

Question 2

Malignant brain tumors are deadly because such tumors
 
  a. can increase the flow of cerebrospinal fluid, thus causing hydrocephalus.
  b. release glutamate.
  c. give off cells that travel to other body areas and result in new tumors.
  d. release glycine, which kills nearby cells.
  e. can only be confirmed at autopsy.

[lorealeza]

Answer to Question 1

Answer: b. a benign tumor is encapsulated by a distinct border.

Answer to Question 2

Answer: c. give off cells that travel to other body areas and result in new tumors.