Water temperature influences the onset of fish spawn, aquatic vegetation growth and the biological demand for oxygen in ponds. Temperature increases it holds less oxygen. Also water stratification.
Well I do know the answer to question #5 is temperature
The answer to this question would be: visceral motor
The muscle in the stomach is not consciously moved. The muscle regulated automatically by the nervous system based on some mechanism like other organs. The things that can influence the muscle would be when the autonomous nervous system is activated. This kind of motor innervation is called visceral motor.