Answer:
family
Explanation:
According to Call of the Wolf by Jack London, the story is narrated in the third person anonymous narrative and talks about a dog Buck who lived a relatively comfortable life on Judge Millar's estate but is eventually drafted to become part of a team of dogs that pulls sleds.
Buck regains his primal instinct of hunting and scavenging as he is thrust into the wild by his numerous masters.
Therefore, whenever Buck's ancestors are mentioned, it evokes the concept of family.
In his "Letter from a Birmingham Jail", Martin Luther King Jr. resort to Socrates to highlight his practice of a fair form of civil disobedience and non violence, as a symbol or analogy to back up his interjection outlining the urge of awakening from the "dark depths of prejudice and racism" of society at that time.
I would probably say something that tells her how important she is to you and how much you appreciate her friendship. Make sure that she feels special.
Ex. Hey! Thanks for being such a great friend (and twin!) I really appreciate you and I hope that you have a GREAT birthday!
Ex. Hey! Happy birthday to my best friend/twin. I can't express how much you mean to me and how much I appreciate how you are always there for me no matter what. I don't know what I would do without you. Have a happy birthday!