Infection can cause bodily tissues to swell, and bacteria can cause infection. Given these facts, what can cause bodily tissues to swell among the following options: - gravity - chickenpox - bacteria - influenza - smallpox - viruses - skin tissue - weathering
bacteria

Plant reproduction often requires pollen, and bees are usually required for effective pollen transfer. Given these facts, what does plant reproduction often require among the following options: - viruses - bacteria - fire - DNA - bees - seeds - energy - food
bees

Q: Rain causes erosion, and rain is liquid precipitation. Given these facts, what causes erosion among the following options: - standing water - coastlines - mouth of rivers - ice wedging - liquid precipitation - Physical weathering - trees - gravity
A: liquid precipitation

Question: Aradio converts electrical energy into vibrations, and ordinary hearing is the result of the stimulation of bones in the inner ear by means of vibration. Given these facts, what can human ears hear among the following options: - radio - time - waves - Frogs - Frogs. - light - xrays - sound
Answer: radio

*Question*
Threatening behavior by predators causes a porcupine to extend its quills, and fishers are predators that can eat porcupines. Given these facts, what might a porcupine do if threatened by a fisher among the following options: - dig in the dirt - Decrease bodily water - killing insects - lower its quills - kill them - humans disturb it - show its teeth - show its quills
**Answer**
show its quills

(Question)
Electricity sometimes is used for heating buildings, and heating is by electric convector radiators. Given these facts, what are radiators used for among the following options: - Water - warmth - homes - energy - Lift - Cooking - Air conditioning - Heat
(Answer)
Heat