What parts of a nucleotide make up the backbone of a nucleic acid?

Y’all i need answers plss people are saying me and my brother look alike although we’re two different ages. one year apart i’m a girl, btw i’m thinking we could be fraternal twins idk my parents and my friends think we look alike

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

Make a claim about the factors that cause inherited genetic variations within populations. also make a claim about the effects of mutations.