Rna and proteins combine in cells to form structures called ribosomes. ribosomes contain the enzyme active site for peptide bond formation. based on their chemical structures, do you think protein or rna molecules actually form the active site within the ribosome?

a) it could be either, because both molecules have catalytic properties.
b) protein, because only proteins can catalyze a reaction that involves another protein
c) rna, because proteins cannot catalyze a reaction that involves another protein
d) protein, because rna cannot catalyze reactions

when it's short and dry.

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs