input with options: Fact 1: Population density is the average number of individuals per unit of area or volume. Fact 2: Population density varies considerably. Given the two facts above, the average number of individuals per unit of area or what can vary considerably?
OPTIONS:
- Decibels
- colors
- dense
- Summer
- volume
- seasons
- animals
- decreases
output: volume

input with options: Fact 1: Cancer cells divide more often than normal cells, and grow out of control. Fact 2: Cancer can cause death. Given the two facts above, what can occur when cells divide more often than normal cells and grow out of control?
OPTIONS:
- respiration
- cell walls
- loss
- procreation
- death
- anemia
- fever
- disease
output: death

input with options: Fact 1: Many consumers feed at more than one trophic level. Fact 2: Each level on the pyramid represents a trophic level. Given the two facts above, many consumers feed at more than one what?
OPTIONS:
- ground level
- kinetic energy
- major threat to health
- level of sound
- eat plants or other animal
- level on the pyramid
- level of height
- Inches or fractions of inches.
output: level on the pyramid

input with options: Fact 1: Arainbow is formed by refraction of light by separating light into all different colors. Fact 2: Rainbows are an optical phenomena due to the diffraction of light waves. Given the two facts above, a rainbow is formed by what into all different colors?
OPTIONS:
- movement
- diffraction
- photons
- shaping
- focusing a lens
- recalling
- sunlight
- spreading
output:
diffraction