The basic unit of structure and function of living things is the A nucleus B cell C tissue or D membrane PLZ QUICK worth 20 points

B. cell

Explanation:

A cell is the smallest unit of a living thing. A living thing, whether made of one cell (like bacteria) or many cells (like a human), is called an organism. Thus, cells are the basic building blocks of all organisms

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added