The process by which molecules such as oxygen are moved into cells along their concentration gradient directly through the cell membrane is called

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

Describe two recent or ongoing space missions.

To be or not to be that is da question