Population bottlenecks. but their genes still carry the marks of this bottleneck: they have much less genetic variation than a population of southern elephant seals that was not so intensely hunted.
The term "lipid" does not specify a particular chemical structure. Whereas one can write a general formula for an amino acid, nucleic acid, or protein, lipids are much more chemically diverse. Compounds are categorized as lipids based on their greater solubility in organic solvents than in water.
Zero degrees latitude is the line designating the Equator and divides the Earth into two equal hemispheres (north and south).
No because we keep putting it into the earth also decomposing animals give off carbon.
