A good advancement would be a portable radio. They have made life easier for people who are walking/hiking and are looking for something such as the weather for the night or the score for a sports game.
AP BIO !!! That is the hardest AP class.
Answer:
Rusting metal can: Chemical
Boiling water: Physical
Crushing aspirin: Physical
Exploding nitroglycerin: Chemical
Answer:
C
Explanation:
This is what I put on my test, but I'm not sure if it's correct.