If a hydrogen atom has two neutrons and one proton, what is the mass number

Me . based on the data in your tables, did the light-colored moths have a higher or lower survival rate after the industrial revolution?

The genetic code is essentially the same for all organisms. based on this information, one can logically assume which of the following statements to be correct? a. dna was the first genetic material. b. the same codons in different organisms translate into the different amino acids. c. different organisms have different numbers of different types of amino acids. d. a gene from an organism can theoretically be expressed by any other organism. e. all organisms have experienced convergent evolution.

Which characteristics describe a spiral galaxy?