Lichen will colonize the bare rock.
Your DNA is comprised of chromosomes which is comprised of genes. Your genes determine which inherited traits you receive from your parents. When you parents "make you" they each donate 16 chromosomes that contain many genes. These chromosomes make up your DNA, which effects your inherited traits such as, eye color, and hair color.
Hope this helps!
The immune system<span> is made up of a chain of cells, tissues, and organs that work together to protect the body. </span>
