The sympathetic division of an autonomic nervous system

Q1. Why is the sympathetic division of an autonomic nervous system active just before the race?

What changes do you think are occurring in digestive and urinary systems at this time?

Q2. Water is most dense and therefore heavier at 4 degrees Centigrade. At zero degrees Centigrade ice forms and can float on liquid water. Assume ice were most dense at zero degrees Centigrade. Select the best explanation of what would happen in aquatic systems.

Q3. Explain the story of how variation within horse (as in series of changes in horse hoof) brings about evolutionary change in them (from fox-sized, forest-dwelling Hyracotherium to modern horse over geologic time scales).

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