1 heat and no resources for new organisms 2 frogs may bred to be a different color there are disadvantages and advantages to natural selection the bird eats the lighter color frog and the darker frog lives
If the alcohol concentration in PEA agar was increased, it would inhibit both Gram - and Gram + bacteria by breaking down membrane absorbency barrier, tolerating influx of substances that are generally blocked and leakage of cellular potassium. High alcohol concentrations would lead to disruption or halting of DNA synthesis in both Gram + and Gram - bacteria
