*Question*
If caves can be formed by carbonic acid in groundwater seeping through rock and dissolving limestone, then what is one element used to create caves? Answer choices: - sunlight - heat energy - Calcium carbonate - hydrogen and oxygen - calcite - carbonic acid - less water - salinity
**Answer**
carbonic acid

*Question*
If homeostasis mediates cell activities, then what does homeostasis mediate? Answer choices: - sweating - cardiac arrest - keeping the dog warm - cell activities - Plants growth - Animal survival - reproduction - photosynthesis
**Answer**
cell activities

*Question*
If electricity completes a loop in a circuit to work properly, then what does electricity need to do to work properly? Answer choices: - absorb light energy - heat is produced - Have access to air - Submerged in water - Be plugged in - Complete a loop in a circuit - it keeps an organism warm - Burning fuel and air
**Answer**
Complete a loop in a circuit

*Question*
If boiling salt water causes the water to evaporate while leaving salt behind, then what happens when salt water is boiled? Answer choices: - salt changes into other things - flow of electrons - water is evaporated - water freezes - salt is evaporated - prolactin release - Plant growth is reduced - looseness of dirt or compost
**Answer**
water is evaporated