The plasma membrane has a double layer of phospholipids with proteins dispersed throughout. These proteins help increase the durability of the membrane, as well as help with filtration.
Viruses are not made out of cells, they can't keep themselves in a stable state, they don't grow, and they can't make their own energy. Even though they definitely replicate and adapt to their environment, viruses are more like androids than real living organisms.
It can be caused by mutation, random mating, random fertilization, and recombination.
Hope this helps :)
Alpha and delta waves. Delta waves are common during deep sleep in which dreams and R.E.M. Occurs.
