Select the best answer

which of the following events define the proterozoic eon?

-eukaryotic cells first seen
-stable continents
-first bacterial fossils
-cambrian explosion
-oxygen builds up in atmosphere

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).

Explain why scientists use the word dominant for certain traits.

Why are human population trends difficult to predict?