Given a scientific question, generate a correct answer to it.

[EX Q]: What term is used to describe major changes in the genetic material?
[EX A]: chromosomal alterations

[EX Q]: What cells do lymphocytes originate from in the bone marrow?
[EX A]: stem cells

[EX Q]: What is the ability to be attracted by a magnet and to act as a magnet?
[EX A]:
magnetism