Salts to maintain the natural ionic concentration of an organism.

true or false

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

Which type of respiration takes place when there is no oxygen present

Eutrophication caused by human nutrient pollution.