*Question*
If soil loss causes a river to become deeper and wider, then what loss causes a river to become deeper and wider? Answer choices: - cut - fish - rain - storms - eroded - water - habitat - soil
**Answer**
soil

*Question*
If birds can have a positive impact on plants, then which can have a positive impact on plants? Answer choices: - Nutrient deprivation - Brown rot - trees - Birds - colors - Drought - wind - LEDs
**Answer**
Birds

*Question*
If uneven warming of the Earth's surface causes wind, then what does uneven warming of the Earth's surfaces cause? Answer choices: - Winter - harm - wind - sweat - Injury - SNPs - force - warmth
**Answer**
wind

*Question*
If memory cells help keep people from getting sick, then what helps keep people from getting sick? Answer choices: - virus - sweating - bacteria - sensory neurons - Exfoliation - layers of fat - trees - Memory cells
**Answer**
Memory cells