What can the fossil record tell us about present day organisms?

The fossil record can give us a look into the past showing us what different organisms looked like and how they evolved over time. Over time, organisms change due to everything from weather to food to landscape and by looking at the fossil record, we can explain why certain animals are the way that they are and how they were before.

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

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 . : ) : ) : )