What functional groups define the two different ends of a dna strand?

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

The transport tubes for food coming down the plants are called?

Explain why the plants cortex would serve as the best food source for animals