Once we had photosynthesis what was pumped into the environment

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

What is the most abundant vertebrate on earth?

The main ingredient of magma is a pahoehoe. b silca c dissolved gases d obsidian