What are the rungs of the dna ladder made of?

What is the relationship between absorbance of light and the rate of photosynthesis?

How is the national wildlife refuge system similar to the pacific region coastal program? a. both programs are concerned with providing habitats for wildlife b. both programs are primarily concerned with preserving fish species c. both programs have set aside 150 million acres of land d. both programs are under the u.s. fish and wildlife service

What is the term for a water wave that is created by an underwater earthquake?