Fact 1: Threatening behavior by predators causes a porcupine to extend its quills. Fact 2: Similarly, threatening or intimidating behaviors are also forbidden. Given the two facts above, answer the question "What defense mechanism does a porcupine use when intimidated?" with the following options: - eardrum - deadly - sound - instincts - steroids - organ - quills - blastoids
quills

Fact 1: Plasma cells are activated B cells that secrete antibodies. Fact 2: Antibodies kill bacteria. Given the two facts above, answer the question "What kills bacteria?" with the following options: - rays or beams - Plasma cells - Cooking - an electric stove - Petri dish - deal - phlange - evaporation
Plasma cells

Q: Fact 1: Playing is just one of many ways that mammals and other animals learn how to behave. Fact 2: Children learn through play and in other ways. Given the two facts above, answer the question "How do children learn?" with the following options: - reusing materials - allow growth - by lying - Riding a bike - in many ways - exercise - by sleeping - just one way
A: in many ways

Question: Fact 1: Preventing the transfer of heat from an organims 's body causes that organism to keep warm. Fact 2: Leaves can keep animals warm. Given the two facts above, answer the question "How do leaves keep animals from getting cold? " with the following options: - can be worn as clothes - protect them - adapt to coolness - heat with the sun - used to start fires - hard outer covering - preventing heat transfer - A transportation fuel
Answer: preventing heat transfer

*Question*
Fact 1: Male dogs use pheromones in urine to mark their territory. Fact 2: Pheromones are a sub-category of semiochemicals. Given the two facts above, answer the question "What do dogs use to mark their territory?" with the following options: - water - Chemicals - layers of fat - food - Animal fur - heat energy - Scratches - heat produced
**Answer**
Chemicals

*Question*
Fact 1: Operating an automobile usually requires fossil fuels. Fact 2: Fossil fuels are a finite resource. Given the two facts above, answer the question "What powers most automobiles? " with the following options: - Sunlight. - A finite resource. - Natural gas. - an engine - energy of moving objects - Water - a hydraulic system - transportation technology
**Answer**
A finite resource.