Background: Cancer is a disease that causes cells to divide out of control. Normally, the body has systems that prevent cells from dividing out of control. But in the case of cancer, these systems fail. Cancer is usually caused by mutations. Mutations are random errors in genes. Mutations that lead to cancer usually happen to genes that control the cell cycle. Because of the mutations, abnormal cells divide uncontrollably. This often leads to the development of a tumor. A tumor is a mass of abnormal tissue. As a tumor grows, it may harm normal tissues around it. Anything that can cause cancer is called a carcinogen . Carcinogens may be pathogens, chemicals, or radiation.

Situation: Two sisters went to the doctor to get screened for cancer. Lisa had cancer, while her sister Beth didn't. Lisa was terrified, but her sister comforted her.

Question: Which sister had a disease that causes cells to divide out of control?
Answer: Lisa

Situation: Two sisters went to the doctor to get screened for cancer. Lisa had cancer, while her sister Beth didn't. Lisa was terrified, but her sister comforted her.

Question: Which sister did not have a disease that causes cells to divide out of control?
Answer: Beth

Situation: Two sisters went to the doctor to get screened for cancer. Lisa had cancer, while her sister Beth didn't. Lisa was terrified, but her sister comforted her.

Question: Which sister had a disease caused by mutations?
Answer: Lisa

Situation: Two sisters went to the doctor to get screened for cancer. Lisa had cancer, while her sister Beth didn't. Lisa was terrified, but her sister comforted her.

Question: Which sister didn't have a disease caused by mutations?
Answer: Beth

Situation: Two sisters went to the doctor to get screened for cancer. Lisa had cancer, while her sister Beth didn't. Lisa was terrified, but her sister comforted her.

Question: Which sister didn't have a disease caused by random errors in genes?
Answer: Beth

Situation: Two sisters went to the doctor to get screened for cancer. Lisa had cancer, while her sister Beth didn't. Lisa was terrified, but her sister comforted her.

Question: Which sister had a disease caused by random errors in genes?
Answer: Lisa

Situation: Two sisters went to the doctor to get screened for cancer. Lisa had cancer, while her sister Beth didn't. Lisa was terrified, but her sister comforted her.

Question: Which sister had more abnormal cells divide uncontrollably?
Answer: Lisa

Situation: Two sisters went to the doctor to get screened for cancer. Lisa had cancer, while her sister Beth didn't. Lisa was terrified, but her sister comforted her.

Question: Which sister had fewer abnormal cells divide uncontrollably?
Answer: Beth

Situation: Two sisters went to the doctor to get screened for cancer. Lisa had cancer, while her sister Beth didn't. Lisa was terrified, but her sister comforted her.

Question: Which sister had a greater chance of developing a tumor?
Answer: Lisa

Situation: Two sisters went to the doctor to get screened for cancer. Lisa had cancer, while her sister Beth didn't. Lisa was terrified, but her sister comforted her.

Question: Which sister had a smaller chance of developing a tumor?
Answer: Beth

Situation: A team of scientists studied two groups of mice. Group C was exposed to carcinogens, while group N was not.

Question: Which group of mice had more cells to divide out of control?
Answer: Group C

Situation: A team of scientists studied two groups of mice. Group C was exposed to carcinogens, while group N was not.

Question: Which group of mice had fewer cells to divide out of control?
Answer: group N

Situation: A team of scientists studied two groups of mice. Group C was exposed to carcinogens, while group N was not.

Question: Which group of mice had fewer mutations?
Answer: group N

Situation: A team of scientists studied two groups of mice. Group C was exposed to carcinogens, while group N was not.

Question: Which group of mice had more mutations?
Answer: Group C

Situation: A team of scientists studied two groups of mice. Group C was exposed to carcinogens, while group N was not.

Question: Which group of mice had more random errors in genes?
Answer: Group C

Situation: A team of scientists studied two groups of mice. Group C was exposed to carcinogens, while group N was not.

Question: Which group of mice had fewer random errors in genes?
Answer: group N

Situation: A team of scientists studied two groups of mice. Group C was exposed to carcinogens, while group N was not.

Question: Which group of mice had fewer abnormal cells divide uncontrollably?
Answer: group N

Situation: A team of scientists studied two groups of mice. Group C was exposed to carcinogens, while group N was not.

Question: Which group of mice had more abnormal cells divide uncontrollably?
Answer: Group C

Situation: A team of scientists studied two groups of mice. Group C was exposed to carcinogens, while group N was not.

Question: Which group of mice had more tumor development?
Answer: Group C

Situation: A team of scientists studied two groups of mice. Group C was exposed to carcinogens, while group N was not.

Question: Which group of mice had less tumor development?
Answer: group N