In two paragraphs explain how our planet's environment and living things affected each other to shape the history of life on earth.

What noticeable trend from this graph might be used to make a conclusion?

What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).

Compare the shapes of the bones of the human skull with the shapes of the bones of the human leg. how do the shapes differ? why are the shapes important?