Avery acidic ph level is , and very basic ph level is

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

Rna primer constructed during dna replication needs to be replaced because rna differs from dna. it contains ( adenine, cytosine, uracil ) instead of ( adenine, guanine, thymine ).

If it turned out dinosaurs were colorblind, how would this affect some assumptions scientists have made about them?