Fact 1: Evaporation of sweat uses energy, and the energy comes from body heat. Fact 2: Because food contains energy. Given the two facts above, what requires food?

OPTIONS:
- Evaporation of sweat
- hydration of their cells
- Most plants
- Microscopic organisms
- agriculture
- to stay alive
- female sex cells
- plant life

Answer: Evaporation of sweat

Fact 1: Sinkholes are formed by precipitation. Fact 2: Eventually, the sinkhole collapses into cavern. Given the two facts above, precipitation filling an underground void can create what?

OPTIONS:
- clouds
- soils
- cavern
- electricity
- mountain
- rain
- rivers
- flooding

Answer: cavern

Fact 1: Lymphocytes are the key cells involved in the immune response. Fact 2: Lymphocytes are produced in the bone marrow. Given the two facts above, where are the key cells involved in the immune response made?

OPTIONS:
- bloodstream
- humans
- mitosis
- bone marrow
- organs
- Epidermis
- critical organs
- stomach

Answer: bone marrow

Fact 1: Alaser is used for producing light. Fact 2: And rays of light shine on the ground. Given the two facts above, what can a laser produce?

OPTIONS:
- energy
- power
- a beanstalk
- a flowering plant
- fibers
- a wave
- a ray
- a piece of paper

Answer:
a ray