After slavery was abolished, most white southern planters decided
to switch industries.
needed a new system of labor.
experimented with different crops.
divided up land ownership.

They most likely didn't have any slave to work for the so they switched industries or made a new way to labor

  Needed a new system of labor.

Explanation:

  After the Civil War began the age known as Reconstruction Era. The Southern faced a difficult task. They had to develop a new system to replace the slaves.

  It was hard for the planters to adjust over the new laws. They were not accustomed to the opposition of the free people. They were used to had all the control on their plantations.

  I hope this answer helps you.

Nonpolar and small polar moleculescan pass through the cell membrane, so they diffuse across it in response to concentration gradients. Carbon dioxide and oxygen are two molecules that undergo this simple diffusionthrough the membrane. The simple diffusion of water is known as osmosis.

This arrangement means that only small, uncharged molecules can pass through the membrane. The membrane is called semipermeable, meaning that some things can pass through without assistance, while other things cannot. Water is a charged molecule, so it cannot get through the lipid part of the bilayer. In order to allow water to move in and out, cells have special proteins that act as a doorway. These proteins are called aquaporins (aqua = water, porin = pore).

hope this helps