Fact 1: Conserving water can be used for survival in a dry environment. Fact 2: Many cacti have corrugated stems which can expand quickly if water becomes available. Given the two facts above, what feature of many cacti help them survive in dry environments?
OPTIONS:
- exoskeleton
- Spines for hunting
- Expandable stems
- an external framework
- cactuses
- Cooling pipes
- genetic diversity
- Loud organ pipes
Expandable stems

Fact 1: Ants communicate with chemicals called pheromones. Fact 2: Pheromones are insect hormones. Given the two facts above, how do ants communicate?
OPTIONS:
- With their voice
- Chemical energy
- mechanical waves
- With their eyes
- during the day
- With their movements
- With their hormones
- electrically

Answer: With their hormones

Question: Fact 1: Viruses cannot reproduce by themselves. Fact 2: Some smallpox viruses are maintained in laboratories. Given the two facts above, what cannot reproduce by itself?
OPTIONS:
- Acids
- all plants
- anemia
- smallpox
- cigarettes
- all corals
- all bacteria
- acetic acid
Answer: smallpox

input with options: Fact 1: Biodiversity increases the productivity and stability of ecosystems. Fact 2: An ecosystem includes the organisms and their habitat. Given the two facts above, what does biodiversity increase the productivity and stability of?
OPTIONS:
- density
- the looseness of soil
- water vapor
- the environment
- h2o
- swamp vegetation
- biological diversity
- organisms and their habitat
output: organisms and their habitat

Q: Fact 1: Magnetism can cause objects to repel each other. Fact 2: Magnets attract and repel. Given the two facts above, what causes objects to attract?

OPTIONS:
- heat energy
- mussels
- insects
- animals
- magnetism
- electrically
- hormones
- power

A: magnetism

Fact 1: Some viruses have an envelope of phospholipids and proteins. Fact 2: Viruses are strange life forms. Given the two facts above, some strange life forms have an envelope of what?
OPTIONS:
- Chemical energy
- biological diversity
- Something coming from a gland
- layers of fat
- characteristics
- phospholipids and proteins
- Positive charges
- visible energy
phospholipids and proteins