Answer and Explanation:
Most young roots have two main regions. An outer cortex and a central cylinder containing the vascular bundles.
The endodermis also referred to as starch sheath. Its cells have a casparian strip which is made up of an impervious waxy deposit on the radial and cross walls. It controls entry of water and dissolved salts into the vascular bundle.
Every soil<span> originally formed from parent material: a deposit at the Earth's surface. The material could </span>have<span> been bedrock that weathered in place or smaller materials carried by flooding rivers, moving glaciers, or blowing winds.</span>
I believe A. Nitrogen is the most abundant Gas.
The first thing a cell needs to do to divide successfully is to "B.increase its ratio of surface area to volume". This allows the cell to reach a "breaking point" at which it can divide into two separate cells.
