The nucleus is not the only source of DNA, besides it, DNA is also found in the mitochondria of all eukaryotic cells, as well as in the chloroplasts of plant cells and such DNA is called extrachromosomal DNA.
The DNA from the mitochondria (mtDNA) and chloroplasts are small and circular, which are similar to the prokaryotic DNA.
mtDNA contains its own genes that encode proteins that are part of the electron transport chain.
<span>Chloroplast DNA encodes for the components of the photosynthetic pathway.</span>
When an animal has a feature that helps them to disguise, in this case specifically making the animal blend into the surroundings, this is called a camouflage. A camouflage is a result of a process by which, under the pressure of natural selection, a feature gets prevalent in a species in order to make this species more fitted to the environment. In this case, the penguins are safer in their environment with this feature. This process is called adaptation, and this is a camouflage adaptation.
Therefore, the correct answer is D. adaptation.
<span>Vitamin b12 deficiency is a problem because Vitamin b12 is very important to the human body. Vitamin b12 helps create red blood cells along with making your DNA. The only way to get Vitamin b12 is by consuming animals.</span>
