Question

question 8
carcinogens
1 pts
□ are naturally occurring and not synthetic
□ are substances that cause cancer
□ always kill cells instantaneously
□ are harmless to normal cells

Explanation:

Carcinogens are substances that can cause cancer. They are not harmless to normal cells (so the first option is wrong). They don't always kill cells instantaneously (so the second option is wrong). They can be both naturally - occurring and synthetic (so the fourth option is wrong).

Answer:

are substances that cause cancer