If an organism contains 400 atoms of carbon, how many would remain after 1 half life?

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

As the human population grows, what happens to our natural-resource requirements? o they increase o they decrease o they do not change. they go in cycles

There are multiple lines of evidence that provide support for common ancestry and evolution. write 3-4 paragraphs describing at least three of them in detail. provide at least one example for each line of evidence.