PLZZZ ANSWER ASAP! 30 PTS! Rust forming on a piece of iron is an example of which of the following: Select one:
a. A chemical change because oxygen atoms from the atmosphere bonded with the iron atoms
b. A violation of the laws of physics because new mass has been created
c. A physical change because the process can be reversed
d. The natural process of decay as metallic ions age

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i