I think it would be A due to animal adaptation over hundreds of years. Hope this helps. :)
Pectoral girdles (4 bones) - Left and right clavicle (2) and scapula (2).
Arms and forearms (6 bones) - Left and right humerus (2) (arm), ulna (2) and radius (2) (forearm).
Hands (54 bones) - Left and right carpals (16) (wrist), metacarpals (10), proximal phalanges (10), intermediate phalanges (8) and distal phalanges (10).
Pelvis (2 bones) - Left and right hip bone (2).
Thighs and legs (8 bones) - Left and right femur (2) (thigh), patella (2) (knee), tibia (2) and fibula (2) (leg).
Feet and ankles (52 bones) - Left and right tarsals (14) (ankle), metatarsals (10), proximal phalanges (10), intermediate phalanges (8) and distal phalanges (10).
It is important to realize that through anatomical variation it is common for the skeleton to have many extra bones
Answer: D volcanic eruption
Answer:
A Proteins from the ER are modified and packaged by the Golgi apparatus.
Oxidative phosphorylation relies on the hydrogen ion concentration gradient generated and maintained by the electron transport chain.
Hydrogen ions are actively transported out of the mitochondrial matrix.
Hydrogen ion concentration is higher in the intermembrane space than in the mitochondrial matrix.