White matter is the slightly more pale tissue in the areas of the brain and spinal cord. It consists of nerve fibers with their myelin sheaths (the fatty substance that surrounds and "protects" the axon.
The plants can be classified based on their vascular and reproductive structures. The plant given in the image belongs to the Bryophyta.
<h3>What is Bryophyta?</h3>
The non-vascular plants that are a part of the plant classification are found in moist places and are small in size belongs to the Bryophyta.
The plant of this classification have a leafy multicelled plant body, that lacks true leaves, roots, and stems. They are green plants and also contains chloroplast for food synthesis.
The vascular tissue like xylem and phloem are completely absent and hence the transportation does not occur through specialized systems.
Therefore, option A. Bryophyta is the plant growing on the rock.
Learn more about Bryophyta here:
brainly.com/question/1435423
The answer is B) These fuels are available in a limited supply- - when the fuel is used it is no longer available.