I believe the answer is 6
Body Tissues. Tissue is a group of cells that have similar structure and that function together as a unit.
The R-COOH. Unbranched hydrocarbon chain with carboxyl at one end. science textbook :)
You dont give use the amount of info we need to answer this...
A thought that can and/or has been tested multiple times to prove it's true or false. And is used by others if prove true.
