If you have three fatty acids attached to a glycerol, it is called a Triglyceride.
The period is the time it takes the satellite to make a complete orbit around the central object. As the distance increases, so does the period because the orbit becomes longer because the radius increases.
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He inferred that similar changes had happened in the past. Uniformitarianism combines the idea of gradual change over time with Lyell's observations that such changes have occurred at a constant rate and are ongoing.
Answer:
Nitrogen is essential for all living things because it is a major part of amino acids, which are the building blocks of proteins and of nucleic acids such as DNA, which transfers genetic information to subsequent generations of organisms.
