2 Polnis
A fundamental characteristic of scientific knowledge is that:
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A. direct observation is the only way to confirm a theory.
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B. all scientists agree about how nature works.
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c. scientific explanations are rarely proven to be wrong.
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D. some ideas change as new evidence is found.

examples of nucleic acids are deoxyribonucleic acid (dna) and ribonucleic acid (rna).

what are the options? add them, then i will be glad to .

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )