I think the answer here is neurons, the nerve cells
The main purpose is protection. The lipid bilayer protects the cell from viruses and other threats to the cell. It also maintains homeostasis within the cell by monitoring the amount of substances the enter or exit the cell.
The correct answer is
<span>D. All the populations and the surrounding environment</span>
I think it is A to, since the tissues are the closet thing to cell, which microscopic anatomy studies.
Try using this website to answer your question
https://www.wiley.com/college/boyer/0470003790/structure/tRNA/trna_text.htm