*Question*
Q: What is the outer core made of? Choices: - compressed air - solid rock - solid iron - liquid metal A:
**Answer**
liquid metal

*Question*
Q: What is a relationship between living things that depend on the same resources? Choices: - parasitic - symbiotic - contention - competition A:
**Answer**
competition

*Question*
Q: The duodenum has a major role in regulating what digestive organ and its emptying? Choices: - kidneys - skin - respiratory - stomach A:
**Answer**
stomach

*Question*
Q: What have a symbiotic relationship between a fungus and a photosynthetic organism? Choices: - crustaceans - amphibians - sponges - lichens A:
**Answer**
lichens