Which contributes to the polarity of a water molecule?

Which of these is not a nucleotide base found in dna?

Which statement describes compounds a. compounds are made of one type of atom. b. compounds cannot be represented by models. c. compounds are represented by chemical formulas. d. compounds cannot be broken down into simpler forms.

Which to produce involved from a symbiotic relationship of organisms which resulted in eukaryotic organisms contain chloroplast