B, I think is the answer. Hope it helps :)
Working with skeletal muscles, tendons, ligaments and joints, the bones form the moving machinery of human body. The major role of bones in movement is that they act as levers, which make use of the forces generated by skeletal muscles in a beneficial way.
Rising global temperatures in the ocean lead to the following: "<span>a. As water warms, it can hold less carbon dioxide, so more CO is released into the atmosphere, where it is a greenhouse gas."</span>
Mitochondria
This organelle is only found in eukaryotic cells.
Explanation:
The sea horse is a higher organism and is composed of eukaryotic cells. Eukaryotic cells have mitochondria in which most energy production occurs through aerobic respiration (Krebs cycle). The sea horse gets it oxygen from the seawater that has dissolved gases (oxygen included). The gills of the sea horse are analogous to lungs in land animals. Mitochondria produces 34 ATPs as opposed to anaerobic respiration that occurs in the cell cytoplasm that generated a net of 2 ATPs. These ATPs power the mentioned cellular activities of the cells of the sea horse.
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