Question

aerobic respiration extracts more energy from a glucose molecule than any other type of respiration why might some organisms that can use aerobic respiration also retain the ability to use aerobic respiration

Answer 1

most organisms use O2 in aerobic respiration to produce ATP. Almost all animals, most fungi, and some bacteria are obligate aerobes, which require oxygen. Some plants and fungi and many bacteria retain the ability to make ATP without oxygen.