Specific heat is the amount of heat needed to raise the temperature of one kilogram of mass by 1 kelvin.
According to Chargaff's rule, pyrimidine and purine occur in equal ration (1:1) in the DNA of all cells. Adenine (A) and Thymine (T) occur in equal proportion while Guanine (G) and Cytosine (C) occurs in equal proportion in the DNA of an organism. This pattern is repetitive and found in both DNA strands.
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I believe the answer is wave summation. They result when one wave of contraction is added to another. A 2nd contraction of the muscle occurs before relaxation of the first contraction is complete. When the stimuli is not strong to enable muscle contraction, it continues to add stimuli until the muscle contracts.