What event within the food chain might lead to the graph shown below

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?

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

Why do we perceive objects as retaining their brightness under different lighting levels?