Select all that apply. What are the two base pairs that form the ladder rungs of DNA? guanine-adenine
thymine-cytosine
cytosine-guanine
adenine-thymine
cytosine-adenine

What are the percent by mass of copper in penny lab

Achemist wants to extract copper metal from copper chloride solution. the chemist places 0.50 grams of aluminum foil in a solution containing 0.75 grams of copper (ii) chloride. a single replacement reaction takes place. (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction? a) approximately 0.36 grams, because copper (ii) chloride acts as a limiting reactant b) approximately 1.8 grams, because copper (ii) chloride acts as a limiting reactant c) approximately 0.36 grams, because aluminum acts as a limiting reactant d) approximately 1.8 grams, because aluminum acts as a limiting reactant

How does kepler second law of planetary motion overthrow one of the basic beliefs of classical astronomy