Which of the following organisms is located only in the third trophic level of the soil food web

What protects the lining of the stomach from acidic gastric juices?

What are some characteristics of a free enterprise economy?

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils