Fact 1: Having no natural predators increases population size. Fact 2: Population size is a function of natality and mortality. Given the two facts above, having what is a cause of mortality?

OPTIONS:
- natural predators
- seasons
- Abnormal cell growth
- liver cancer
- insects
- chickenpox
- influenza
- sunlight

Answer: natural predators

Problem: OPTIONS:
- A compound that donates proton
- attach themselves to cells
- have sex with another virus
- distances themselves from cell
- attach themselves to viruses
- it needs them
- rapid expansion
- By wind and rain
Q: Fact 1: Viruses cannot reproduce by themselves. Fact 2: Viruses attach themselves to cells and reproduce. Given the two facts above, how can viruses make copies of themselves?
Answer: attach themselves to cells

Problem:OPTIONS:
- engines
- Pollution
- heat energy
- sensory neurons
- Firecrackers
- animal transport
- to move people
- warmth

Fact 1: Alight bulb converts electrical energy into light energy when it is turned on. Fact 2: Light energy is converted into heat energy. Given the two facts above, electrical energy is converted into?
****
A: heat energy

Fact 1: The vomiting reflex is used to remove toxic material from the stomach before it is absorbed. Fact 2: An overdose can cause vomiting. Given the two facts above, what must be removed from the stomach before it is absorbed?
OPTIONS:
- hormones
- Proteins
- all liquids
- bacteria
- nutrients
- steroids
- an overdose
- Bodily water
an overdose

Fact 1: When metal conducts heat , that metal expands. Fact 2: Gold is a precious metal. Given the two facts above, what expands when it conducts heat?
OPTIONS:
- sodium
- glass
- an ion
- liquid
- gold
- lipids
- copper
- coal

Answer: gold

input with options: Fact 1: Coal is used for generating heat by burning. Fact 2: Heat comes out the top and can be used for cooking or space heating. Given the two facts above, food can be cooked using what?
OPTIONS:
- lipids
- energy
- corn
- fats
- sugar
- rice
- Coal
- oil
output:
Coal