0/1 Rivers create landforms as they move across the surface of the earth.
Rivers move as water flows from - *
High in the mountains, down to oceans and lakes
Regions that have warmer temperatures to cooler ones
Because they are pushed by strong winds

From east to west as the earth rotates

carbohydrates: (starches and sugars) composed of carbon, hydrogen, and oxygen.

lipids: (fats, oils, and waxes) are made of carbon and hydrogen atoms.

nucleic acids: contain hydrogen, oxygen, nitrogen, carbon, and phosphorus. they are polymers of nucleotides. a nucleotide has three parts, a 5-carbon sugar, a phosphate     (-po⬇️4) group, and a nitrogenous base.

proteins: made up of nitrogen, carbon, hydrogen, and oxygen. they are polymers of amino acids.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.