Conservation :) Conservation is the preservation of things in wildlife and nature.
The answer is B.
A cannot be the answer as living things can reproduce asexually, which is by budding.
C cannot be the answer as we humans who are also living things cannot make our own food.
D cannot be the answer as single-cell organisms such as a plankton do not need an organ system, since all life processes in the organism occur in one cell.
Hope this helps! :))))
Testing mitochondrial DNA is ess expensive but more time consuming than testing nuclear DNA. <span>Mitochondrial DNA contains thousands of copies, 37 genes, and a high mutation rate.</span>The difficult part is evaluating over a thousand variants per patient to find possibly one real mutation causing disease.