Answer:
The advantage of small cell size is that substances like organic molecules and ions can diffuse easily into the cells whereas wastes can diffuse easily out of the cells.
They use a formula and that formula is
People/Land Area=Population Density
I had to take a screenshot of my response since it was getting flagged for being inappropriate for some reason.
<span>(</span><span>A. specialized cells that perform specific functions)</span><span>
</span>
It is thigmotropism because it is not affected by gravity or light.