*Question*
If rain causes soil to be washed or blown away, then what causes soil to be washed or blown away? Answer choices: - Roads - rivers - wind - shoveling - clouds - storms - rain - combustion
**Answer**
rain

*Question*
If immunodeficiency causes people to take longer to get well, then what does immunodeficiency do? Answer choices: - enormous damage to homes - Make money - major threat to health - harm them - Plant growth is reduced - Stay sick shorter - Stay sick longer - Get well faster
**Answer**
Stay sick longer

*Question*
If the most primitive multi-cellular animals produce eggs and sperm, then the most primitive multi-cellular animals produce what? Answer choices: - Electrical energy - eggs and sperm - harmful substances - scarce resources - Organic compounds - Chemical energy - fur and fat - aerobic capacity
**Answer**
eggs and sperm

*Question*
If fibers on mammals keep them warm, then what keeps mammals warm? Answer choices: - fibers - eyeballs - white blood cells - fur - the skin - sweating - nostrils - heat
**Answer**
fibers