Why is a food chain a more limited representation of the flow of energy through an ecosystem than a food web? a. a food chain shows only a single pathway of energy. b. a food chain shows multiple pathways of energy. c. a food chain shows all the organisms. d. a food chain has limitations with the organisms involved. its either a or b im sure of

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

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

What materials must dams have to produce electricity, and what must occur?