Two of the four principle classes of organic compounds are proteins and nucleic acids. What is the relationship
between proteins and nucleic acids?

Which organelle releases chemicals that break down large food particles into smaller ones?

The distant ancestors of tigers may have had bodies without stripes. use the theory of natural selection to explain how tigers may have evolved to have stripes.

Which of the following happened during the precambrian era? the first prokaryotic cells the first eukaryotic cells development of photosynthesis all of the above