Question: "I am curious what the valid response is to someone in regards of the talking snake. The apologetic response."
Basically we can only know that the world has regularities because God is in control of it. If God was not in control of it, or did not reveal to us that He is, then we would not be able to predict that the next snake we encounter cannot talk. (It was a serpent by the way.) So if you reject the account in Scripture you have no reason to reject a snake talking. If you accept the account in Scripture then you know that a snake did talk. You also have grounds to say, based on past experience, that snakes usually do not talk because God controls nature in such a way that it exhibits regularity.
Question: “ 'As for your male and female slaves whom you may have-- you may acquire male and female slaves from the pagan nations that are around you. 'Then, too, [it is] out of the sons of the sojourners who live as aliens among you that you may gain acquisition, and out of their families who are with you, whom they will have produced in your land; they also may become your possession. 'You may even bequeath them to your sons after you, to receive as a possession; you can use them as permanent slaves. But in respect to your countrymen, the sons of Israel, you shall not rule with severity over one another. (Leviticus 25.44-46 NASB)
Have you heard the argument that "the Bible supports slavery"? What do you say to those people? ”
It does but you need to specify what kind of slavery and look at what practices the Bible condemns in slavery. There were actually options given in Scripture for slaves to stay if they wanted to after they had served for a certain amount of time! Indeed, there were slaves even being counted as covenant members in some instances. And what is the argument? Here is mine: On what grounds do you either condemn or approve of slavery apart from God?