Plzz answer : sodium chloride breaks down into sodium and chlorine. why is this process classified as a chemical reaction? a. a substance has been changed into a different substance. b. change can only occur in one direction. c. there is greater mass of the sodium chloride than there is of the products. d. the original molecular formula has been altered

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

Individuals do not compete directly for resources, but are prey for the same predator

What factors contribute to the effect an environmental toxin has on the human body?