What happens to the pressure as you go further down into the earth's center

1. which of the following is correct regarding opiates/opioids: a. they all have a natural component as a starting pointb. they have low addiction possibilitiesc. methadone binds to some of the same receptorsd. a and care correcte. all are correct

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

The law of thermodynamics states that energy can't be created or destroyed. to natural sources of energy on earth are the