I think its "circuit" but thats just a guess
Their prey would decrease
Answer:The green growing on the penny of copper and the rust forming on the nail of iron are chemical changes. Boiling away salt water, scraping iron filings from a mixture of sand with a magnet, and breaking a rock with a hammer, are physical changes.
Explanation:
A scientist would most likely need to update her model when it no longer supports the latest results.
