How does the ozone layer maintain ground-level air quality?

If a grape were placed in a hypertonic solution what would happen and why?

Based on the data in the graphs do you think pepsin and trypsin are found in the same part of the body? explain your answer.

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.