Overpopulation, pollution, burning fossil fuels, and deforestation. Changes like these have triggered climate change soil erosion, poor air quality and undrinkable water.
<span>the type of cell that is capable of self-renewal is : Stem cells
Stem cells have the ability to undergone several cycles of cell divisions by maintaining their state. This characteristic allow the people in the medical field to utilize its natural characterisitc to be used in a procedure to fight off cancer throught stem cell transplant</span>
The sub-phyla that would be placed directly around the Craniata are Urochordata and the Cephalochordata.
Urochordates are small marine animals with larvae that swim freely and adults attach themselves to the ocean floor. They are commonly known as tunicates, differ from other chordate subphyla in that the adult form has no notochord, nerve cord,or tail. Cephalochordates or lancelets have notochord extends from near the tip of the tail to well into the anterior of the body. They do not have the braincase, or cranium, of a vertebrate, lancelets are often called acraniates.
My answer will be that the letter "A" in the chromosome refers to "adenine", which is considered as one of the five nitrogenous bases that are part of the nucleic acids (DNA and RNA), which was named in 1885 by Albrecht Kossel.