The answer is letter A. In most organisms cellular respiration usually involves oxygen to produce the most energy. Except in the process of fermentation, where the cells are deprived with oxygen causing it to form bacteria and other forms of organisms within the fermented sample.
Since homologous means same structure different functions, it shows that animals evolve to have the same structure as their ancestors but, have different uses to the part
D is the correct answer. Hope this helps.
