Which is an activity that increases the genetic variation within a population of earthworms?

One variation could be that a similar but different species of worms comes to mate with the original set of worms and their offspring are longer than the original set but shorter than than the second. All the worms including the new ones then mate with each other, increasing the gene pool.

Hope this helps :)

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