Q: Fact 1: Stalactites are formed by deposition. Fact 2: And new sediments such as clay and sand are being deposited by water. Given the two facts above, what are formed by sediments such as clay and sand by water? | OPTIONS:
- detritus
- stalactites
- watershred
- swamp vegetation
- patch reefs
- soft soil
- kalenchoes
- erosion
A: stalactites

Q: Fact 1: Competition may cause animals to fight towards members of their own species. Fact 2: Competition Animals compete for food and shelter. Given the two facts above, what may cause animals to fight towards members of their own species? | OPTIONS:
- Males and females
- food and shelter
- energy of moving objects
- fashion
- jealousy
- vanity
- parasites
- threatened
A: food and shelter

Q: Fact 1: Most carcinogens cause cancer by producing mutations in DNA. Fact 2: DNA DNA is deoxyribonucleic acid. Given the two facts above, most carcinogens can cause cancer by causing mutations to what? | OPTIONS:
- that material's properties
- dexyribonucleic acid
- Veins and arteries.
- Chlorophyll
- harmful substances
- properties
- a lot of human deaths
- characteristics
A: dexyribonucleic acid

Q: Fact 1: Decomposition increases the amount of nutrients in the soil. Fact 2: Organic matter is the plant and animal residue in the soil at various stages of decomposition. Given the two facts above, what does plant and animal residue increase in soil? | OPTIONS:
- Scent
- Temperature
- Bugs
- rainfall
- fossil fuels
- Water
- energy
- Nutrients
A: Nutrients