Fact 1: Plants are the major producers in terrestrial biomes. Fact 2: Biomes are ecosystems that make up the land. Given the two facts above, what are the major produces of ecosystems that make up the land?
OPTIONS:
- Trees
- Energy
- animals
- plant
- food
- Fungi
- grass
- energy.

Answer: plant

Fact 1: Antigens are molecules that the immune system recognizes as foreign to the body. Fact 2: Antigens are expressed by cancer cells. Given the two facts above, what can recognize cancer cells as foreign to the body?
OPTIONS:
- electromagnetic energy
- viruses
- the immune system
- bacteria
- Allergies
- Microscope
- the colon
- turn to a doctor

Answer: the immune system

Fact 1: Fertilization occurs when a sperm and an egg fuse. Fact 2: Fertilization As far as fertilization, timing is critical. Given the two facts above, when is timing critical?
OPTIONS:
- a hemisphere is tilted away from the sun
- object is kicked
- movement of tectonic plates
- flow of electrons
- when the sperm and egg fuse
- Earth revolving around the sun
- Warm air moving into cold air
- seed dispersal

Answer:
when the sperm and egg fuse