oxygen can only hold two bonds with other elements.
Answer:
Any combination of D, E and F
Explanation:
Since A, B, and C belong to different orders, and D, E and F belong to the same order, the latter are more closely related and thus are expected to show a greater degree of structural homology. They are closer to their common ancestor than A, B and C.
Mitochondria- it produces the energy for the cell. the muscle needs more energy because they are always functioning
And autotrophic are those that make their own food from simple substances.