Which statement identifies a characteristic of a scientific theory? It is subjective.
It is a proven fact.
It is based on opinion.
It may change over time.

This is what i found on google“ the monomers combine with each other via covalent bonds to form larger molecules known as polymers. in doing so, monomers release water molecules as byproducts. this type of reaction is known as dehydration synthesis, which means “to put together while losing water. in the process, a water molecule is formed.” i hope this you

Google - what is the first three eras within the phanerozoic eon 

That's false, when you're born your skull has not fused together yet.