How would you respond to doctor smith’s statement?

What are chlorofluorocarbons made 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

Q: a: in sexually reproducing animals, once fertilization of the egg takes place, the exists as a single cell until cell division begins