D! They are both decomposing dead organic matter and metabolizing it through certain pathways to obtain energy! Hope this helped :)
Im not 100% sure but the best answer I can give is Prokaryotes because they came to be around the time oxygen did as well.
Sour receptors occur primarily along the sides of the tongue and are stimulated mainly by acids. Salt receptors are most common in the tip and upper front portion of the tongue. They are stimulated mainly by inorganic salts. Bitter receptors are located toward the back of the tongue
hopefully this helps but i could be really wrong lol
8H2. The actual equation doesn't make sense for 8H2. This is because in compounds it always says the number of atoms after the element symbol, but in this case, there is an 8 before it. This means that it isn't a compound.
It originally cme form the rocks