Discuss variations in temperature and density of seawater with depth in the oceans. Please use Figure 14.3 to help with your discussion. What are the key factors that influence or control temperature and density? Are these variations the same worldwide or are they specific to certain regions? Explain. 
Definitions:
Sarcolemma
The thin, plasma membrane that envelopes a muscle cell (fiber), playing a critical role in muscle contraction.
Z Lines
Positions within muscle fibers that mark the boundaries of sarcomeres, playing a critical role in muscle contraction by anchoring actin filaments.
I Bands
The light-appearing regions of a sarcomere in striated muscle fibers, primarily composed of thin actin filaments.
Zones of Overlap
In muscle physiology, refers to the regions within a sarcomere where actin and myosin filaments overlap, crucial for muscle contraction.
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