Which best examples why a wood-burning fireplace represents an open system.
a. because the ashes have to be swept away
b. because a fire requires oxygen from the atmosphere to burn
c. because they can be used for cooking
d. because they are not all made out of brick

Toorale man murder mystery < - your lab link 1. how was the toorale man found? 2. what did archaeologists learn about the burial? why is the burial important? 3. what information were the scientists able to learn from the skeleton itself? 4. why is the question of whether the injuries came from a stone or steel weapon important? how could scientists distinguish between the different types of weapons? 5. what did the carbon dating and soil testing tell scientists about toorale man? why are the dates interesting for scientists?