Not sure what the choices are but a biotic factor is anything living.
Answer:
The intracellular is where enzymes need to perform optimally or near optimum.
Explanation:
The Km is the concentration of molecules where an enzyme performs at half of its maximum velocity (Vmax). Therefore, when molecules are near Km the enzyme is able to hydrolyze molecules nearer its Vmax.
The other is a result of ones radiation or sun exposure
Answer:
Increase in blood flow; increase in blood pressure
Explanation: