4. Point-source pollution comes from a known source. Which amount is point-source pollution?
a. the difference between E and F
b. the difference between F and G
c. the difference between G and H
d. the difference between H and I

This is one form of rna that transports a specific amino acid to a ribosome during protein synthesis.

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

Chitin is a chemical component of the cell walls