Available choices:
1). it can be seen.
2). major threat to health.
3). remains of prehistoric life.
4). competing for resources.
5). biological diversity.
6). it keeps an organism warm.
7). more abundant.
8). radiation-inducible.

Fact 1: Cancer genes can be inherited. Fact 2: Inherited mutations and inherited afflictions ARE radiation-inducible. Given the two facts above, cancer genes are?
Answer:
8).