Which properties of plastics allow them to be solutions to many complex problems in the world? Check all that apply. chemically resistant
durable
non-reactive
high weight
easy to manufacture

Kelly has come up with an explanation for why her sister is sometimes in a good mood and other times in a bad mood. she speculates that it is based on the hours of sleep her sister got the previous night. this explanation for her sister's behaviors is an example of a(n)