When skeletal muscle cells undergo anaerobic respiration, they become fatigued and painful. this is now known to be caused by
a) buildup of pyruvate.
b) buildup of lactate.
c) increase in sodium ions.
d) increase in potassium ions.
e) increase in ethanol.

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The number of living organisms in a particular area is

Many farmers prefer cattle without horns because it is safer for their herds. the allele for no horns (n) is dominant to the allele for the presence of horns (n). a farmer mates a male with horns to a heterozygous female without horns. what is the chance that the offspring will have horns?