How are viroids different from viruses?

How RER is different from SER?

How is 'cast iron ' different from 'pig iron'?

How do elastomers differ from fibres ? Give an example for each.

What are the difference between multiimolecular and macromolecular colloids? Give one example of each.How are associated colloids different from these two types of colloids.

How Is Novolac different from Bakellte?

Which pair is different from the others?

How is diapause different from hibernation?